CBSE > Class 10 > Mathematics | CBSE Board | Homework Help

an = 5 - 6n 1 ) a1 = 5 - 6= -1 2 ) a2 = 5 - 12 = -7 3 ) a3 = 5 - 18 = -13 d = a2 - a1 d = -7 - ( -1 ) = -7 +1 = -6 now , a = - 1 , d = -6 sum of n terms = n/2 [ 2a + ( n - 1 ) d] Sn = n/2[ 2×(-1 ) + ( n -1 )(-6) ] Sn = n/2 [ -2 -6n + 6 ] = n/2 [4 - 6n ] = n(2-3n ) (I hope this helps you.)?

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If triangle ABCsimilar to triangle pqr and add, PS are medians of triangle ABC and triangle pqr respectively, then prove thatarea of triangle ABC upon area of triangle pqr is equal to a d square upon p s square

Posted by Anushka ?? 5 years, 5 months ago

CBSE > Class 10 > Mathematics

5 answers

Lucifer?? Morningstar?? 5 years, 5 months ago

Yes

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? Pranali.A.P ? 5 years, 5 months ago

Answer wrong hai.kya

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? Pranali.A.P ? 5 years, 5 months ago

It's my pleasure ?

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Anushka ?? 5 years, 5 months ago

Thanks

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? Pranali.A.P ? 5 years, 5 months ago

GIVEN: In ∆ABC & ∆PQR, D & S are the mid points of the sides BC & QR . ΔABC ~ ΔPQR AB/PQ = BC/QR = AC/PR ………...(i) [corresponding sides of two similar triangles are in proportional] Also, ∠A = ∠P, ∠B = ∠Q, ∠C = ∠R …...…(ii) [corresponding angles of two similar triangles are in equal] BD = CD = 1/2 BC and QS = SR = 1/2QR…….…...(iii) [D is the midpoint of BC and S is the midpoint of QR] AB/PQ = BC/QR [From eq (i)] AB/PQ = 2BD/2QS [From eq iii ] AB/PQ = BD/QS……………(iv) In ΔABD and ΔPQS, ∠B = ∠Q [From eq (ii)] AB/PQ = BD/QS [From eq (iv)] ΔABD ~ ΔPQS (By SAS similarity criterion) AB/PQ = AD/PS [corresponding sides of similar triangles are proportional] Hence, proved. (HOPE THIS WILL HELP YOU )?

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In equilateral triangle ABC ,AD perpendicular to BC .prove that 3BCsquare =4ADsquare ( answer me fast )

Posted by Anushka ?? 5 years, 5 months ago

CBSE > Class 10 > Mathematics

5 answers

Anushka ?? 5 years, 5 months ago

Answer sahi h bas mere dimaag mein nahi ghussa??

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Anushka ?? 5 years, 5 months ago

Thanks

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Anushka ?? 5 years, 5 months ago

Arey pehle ans do urgent h baad mein explain kar dungi

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Lucifer?? Morningstar?? 5 years, 5 months ago

in triangle ABC, sides are 'a' units as AD is perpendicular to BC , then in triangle ABD , AB2 = AD2 + BD2 a2 = AD2 + (a/2)2 [ since AD is perpendicular to BC ] a2 - a2/4 =AD2 = 3a2 /4 = AD2 ..........(1) in triangle ADC, AC2 = AD2 + CD2 a2 = AD2 + (a/4)2 3a2/4 = AD2 .........(2) from equation 1 and 2 3 a2 /4 = AD2 3 a2 = 4 AD2 3 AB2 = 4AD2 [since AB = a ]

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Sana(Silent Love).. ?? 5 years, 5 months ago

Hey u dont tell me that why r u deleting this app?

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ANSWER

a2x2+3abx+2b2 Find the roots

Posted by Mohd Aariq 5 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

? Pranali.A.P ? 5 years, 5 months ago

a²x² - 3abx + 2b² = 0 a²x² - 3abx = - 2b² divide each term with a² both sides of the equation , x² - 3bx/a = - 2b²/a² x² - 2 × x × (3b/2a)+(3b/2a)² = ( 3b/2a )² - 2b²/a² ( x - 3b/2a )² = 9b²/4a² - 2b² /a² = ( 9b² - 4b² ) /a² = 5b²/a² x - 3b/2a = ± √ ( 5b²/a² ) x = 3b/2a ± √5 ( b/a ) = [ 3b ± 2√5 b ] / 2a = ( 3 ± 2√5 )b/ 2a (I hope this helps you.)???

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Sum of 2+2

Posted by Yuvraj Sinha 5 years, 5 months ago

CBSE > Class 10 > Mathematics

5 answers

Sana(Silent Love).. ?? 5 years, 5 months ago

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Anushka ?? 5 years, 5 months ago

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? Pranali.A.P ? 5 years, 5 months ago

Sorry bura lga hoga to (i am just joking)

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? Pranali.A.P ? 5 years, 5 months ago

No ...no..no.. u r in nursery ??

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? Pranali.A.P ? 5 years, 5 months ago

I think u r in first standard ??

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ANSWER

Who made this maths sub ?

Posted by Sehaj Wadhwa 5 years, 5 months ago

CBSE > Class 10 > Mathematics

3 answers

Sana(Silent Love).. ?? 5 years, 5 months ago

Those who r tolerating it ( humans)..

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? Pranali.A.P ? 5 years, 5 months ago

Maths is the invention of humans

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? Pranali.A.P ? 5 years, 5 months ago

Beginning in the 6th century BC with the Pythagoreans, the Ancient Greeks began a systematic study of mathematics as a subject in its own right with Greek mathematics. Around 300 BC, Euclid introduced the axiomatic method still used in mathematics today, consisting of definition, axiom, theorem, and proof.

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3X2-7X+3=0

Posted by ? Pranali.A.P ? 5 years, 5 months ago

CBSE > Class 10 > Mathematics

4 answers

? Pranali.A.P ? 5 years, 5 months ago

Thanks

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Lucifer ? Morningstar? 5 years, 5 months ago

X=-(-7)±√13/2×3 => 7±√13/6

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? Pranali.A.P ? 5 years, 5 months ago

Thank u

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Lucifer ? Morningstar? 5 years, 5 months ago

D=(-7)²-4×3×3=> 49-36=> D=13

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If one zero of the polynomial p(x)= (asquare+9)xsquare+45x+6a is the reciprocal of the other, find the value of a

Posted by Dev Mahatma 5 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Exercise 8.2

Posted by Apoorva Pandey 5 years, 5 months ago

CBSE > Class 10 > Mathematics

4 answers

Apoorva Pandey 5 years, 4 months ago

I know it kasht karlenge hum

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Sana(Silent Love).. ?? 5 years, 5 months ago

Very nice reply pranali nd yss its available on this app....?

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Alfiya Khan ? 5 years, 5 months ago

Ya you are right pranali the exercise 8.2is available in the app?

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? Pranali.A.P ? 5 years, 5 months ago

Available in this app ?plz?thoda kasht kre ?

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If sin(A+B) = sinAcosB + cosAsinB nd cos(A-B)= cosAcosB + sinAsinB, find the values of (i) sin75° (ii) cos15°??

Posted by Sana(Silent Love).. ?? 5 years, 5 months ago

CBSE > Class 10 > Mathematics

5 answers

Sana(Silent Love).. ?? 5 years, 5 months ago

Hii avi u r right i m having a very good knowledge about mahabharat not even mahabharat about ramayan as well.. hey why u have asked that what is love nd....( rest question u know).....♥️♥️

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Vaibhav (Silent Love)?? Avi 270505??? 5 years, 5 months ago

Hi Sana Vaibhav here I had seen your chat conversation and I think that you know very well knowledge about Mahabharat ❤️❤️❤️❤️

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? Pranali.A.P ? 5 years, 5 months ago

It's my pleasure ??

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Sana(Silent Love).. ?? 5 years, 5 months ago

Yss.... it really help me thanku so much ??

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? Pranali.A.P ? 5 years, 5 months ago

Value of sin 75°= sin(45+30)° = sin(90-15)°=cos15° sin(45+30)= sin45°cos30°+cos45°sin30° = 1/√2×√3/2+1/√2×1/2........... = √3/2√2+1/2√2.............. = √3+1/2√2............. = sin75° as well as cos15° I HOPE IT HELPS YOU

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What i have to do for best result in board exam tell me the study time table

Posted by Rohan Kumar 5 years, 5 months ago

CBSE > Class 10 > Mathematics

4 answers

Sana(Silent Love).. ?? 5 years, 5 months ago

Aapko ek proper time table bna lena chahiye , reduce the use of phone and apni studies pr concentrate krna chahiye...nd ya after this u r able to get best results in board exams..

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? Pranali.A.P ? 5 years, 5 months ago

Aapko din raat study krni chahiye , then u r able to give board exam ?

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Himansu Yadav 5 years, 5 months ago

Jitna khelo us

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Ishika ? 5 years, 5 months ago

Study ke time phone mat use krna and try to concentrate what you study??☺️☺️☺️

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A shopkeeper sells a saree at8%profit and a sweater at 10% loss and receives ₹1008.If he sells the saree at 10% profit and the sweater at 10% profit and the sweater at 8% loss,he would receive ₹1028.Find the cost price of each item

Posted by Rajvi Kantaria 5 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

? Pranali.A.P ? 5 years, 5 months ago

By selling a saree at 8 % profit and a sweater at 10 % discount, the shopkeeper gets Rs. 1008 ⇒ 108x/100 + 90y/100 = 1008 ⇒ 27x/25 + 9y/10 = 1008/1 Taking L.C.M. of the denominators and then solving it, we get. 54x + 45y = 50400 ............(1) Situation 2 - by selling a saree at 10 % profit and a sweater at 8 % discount, the shopkeeper gets Rs. 1028. ⇒ 110x/100 + 92y/100 = 1028 ⇒ 11x/10 + 23y/25 = 1028/1 Taking L.C.M. of the denominators and then solving it, we get. ⇒ 55x + 46y = 51400 ...........(2) Now, multiplying the equation (1) by 55 and (2) by 54, we get. (54x + 45y = 50400)*55 = 2970x + 2475y = 2772000 ............(3) (55x + 46y = 51400)*54 = 2970x + 2484y = 2775600 .............(4) Now, subtracting (3) from (4), we get. 2970x + 2484y = 2775600 2970x + 2475y = 2772000 - - - ___________________________ 9y = 3600 ___________________________ ⇒ 9y = 3600 y = 3600/9 y = 400 Putting the value of y = 400 in (1), we get. 54x + 45y = 50400 54x + (45*400) = 50400 54x + 18000 = 50400 54x = 50400 - 18000 54x = 32400 x = 32400/54 x = 600 So, the cost price of a saree is Rs. 600 and the list price of a sweater is Rs. 400

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ANSWER

1000000000000-10000000000

Posted by Avi Bobade 5 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

Sweet Sweety 5 years, 5 months ago

9.9E11

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? Pranali.A.P ? 5 years, 5 months ago

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ANSWER

Explain wether 3×12×101+4 is a prime number or composite number. I have a request plz explain this question in video

Posted by Mahi .... 5 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

Study Lover ?‍? ?‍? 5 years, 5 months ago

=3×12×104+4. =3×3×4×104+4. =4(9×104+1)=2×2×(937). It has more than two factors. Hence,it is composite number.

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@S(Raj)Àĺì ???? 5 years, 5 months ago

Mahi yaha video nahi chalta

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ANSWER

2^36 – 1 = 68a19476735 then the value of ‘a’ is ----------------------------- .

Posted by Kishore Murugan 5 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

If f(x)=ax4+bx3+cx2+dx+ e is apolynomial of degree 4having a,B¥and 8as it s zeros ?

Posted by Sweet Sweety 5 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

It is proposed to add to a square lawn measuring 58cm on a side two circular ends .

Posted by Sweet Sweety 5 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

At present Asha's age is 2 more than the square of her doughter Nisha's age. When Nisha grows to her mother's present age , Asha'age would be one year less than 10 times the present age on Nisha . Find the present ages of both Asha and Nisha .

Posted by Asif Nawaz 5 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

T^2+16=0

Posted by Jatin Kumar 5 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Lucifer ? Morningstar? 5 years, 5 months ago

T=-|4|

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ANSWER

Show that there is no positiv integer n for which √ n-1+√n+1is ratinol

Posted by Sweet Sweety 5 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

If a,b,c are in AP then prove that, (bc-a²),(ca-b²),(ab-c²) are in AP.

Posted by Lucifer?? Morningstar?? 5 years, 5 months ago

CBSE > Class 10 > Mathematics

3 answers

Lucifer?? Morningstar?? 5 years, 5 months ago

Koi na

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Yogita Ingle 5 years, 5 months ago

Given: a, b and c ar in AP
As we know, if a, b and c are in AP then 2b = a + c------ (1)

We have to prove that ( bc - a² ), ( ca - b² ), ( ab - c² ) are in AP.
For this we should prove : 2( ca - b² ) = ( bc - a² )+ ( ab - c² )

Let us consider ( bc - a² )+ ( ab - c² )
= ab + bc - (a²+c²)
= b( a + c ) - [ (a + c)²- 2ac] [ ∵ a²+b² = (a + b)²- 2ab ]
= b(2b) - [ ( 2b )²-2ac] [ ∵ From (1) ]
= 2b²- 4b²+ 2ac
= 2ac - 2b²
= 2(ca - b²)

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Anushka ?? 5 years, 5 months ago

Don't know sorry?

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ANSWER

Find 2 no such that the sum of twice the first number nd thrice the second is 92 nd 4 times the first exceeds seven timea the second by 2 ???????

Posted by Sana(Silent Love).. ?? 5 years, 5 months ago

CBSE > Class 10 > Mathematics

5 answers

Sana(Silent Love).. ?? 5 years, 5 months ago

Thanks sanket ??

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Sana(Silent Love).. ?? 5 years, 5 months ago

Hiii mr vaibhav ♥️♥️♥️♥️♥️

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Vaibhav (Silent Love)?? Avi 270505??? 5 years, 5 months ago

Hi sana ♥️♥️♥️♥️

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Lucifer?? Morningstar?? 5 years, 5 months ago

Multiply eq(1) by 2 and subtract eq (2), then,4x+6y-(4x-7y)=184-2 => 13y=182 | | y= 14 and x=25

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Lucifer?? Morningstar?? 5 years, 5 months ago

Let the first no be x and second no be y. A/q2x+3y=92...(1) 4x-7y=2...(2)

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ANSWER

58+5588668

Posted by Sakinsa Muksa 5 years, 5 months ago

CBSE > Class 10 > Mathematics

3 answers

Sweet Sweety 5 years, 5 months ago

5,588,726

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Jagrati Sharma?? 5 years, 5 months ago

5588726 is answer of this que.

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Drift? Boi? 5 years, 5 months ago

Seriously #daytillworldend

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ANSWER

Find the sum of all integers from 1 to 2001

Posted by Abhishek Pal 5 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Study Lover ?‍? ?‍? 5 years, 5 months ago

Sn=2000/2(1+2001)=1000×2002=2002000

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ANSWER

(k+1) X2 - 2 (k-1) X + 1 = 0

Posted by ? Pranali.A.P ? 5 years, 5 months ago

CBSE > Class 10 > Mathematics

3 answers

Vaibhav (Silent Love)?? Avi 270505??? 5 years, 5 months ago

Hi pranali ??????❤️♥️♥️❤️

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? Pranali.A.P ? 5 years, 5 months ago

Hmmm ?

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Drift? Boi? 5 years, 5 months ago

Iss lockdown me hum kaha ho sakte hai mam ?

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ANSWER

Show that any number of the form 6n,where n€N can never end with the digit 0.

Posted by AรЂutøรЂ Kůmåř 5 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

AรЂutøรЂ Kůmåř 5 years, 5 months ago

Thanx ?????❤?

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Aditya Chaturvedi 5 years, 5 months ago

Taking some examples of the numbers ending with digit 0 like 10=2×5,20=2×2×5,30=2×5 Here we note that numbers ending with digit 0 has both 2 and 5 as their prime factors Whereas prime factors of 6n is (2×3)n and fire is not in the prime factorization of 6n so it cannot be end with digit 0 I hope you will understand

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