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

If possible,let √p be a rational number.
also a and b is rational.
then,√p = a/b
on squaring both sides,we get,
(√p)²= a²/b²
→p = a²/b²
→b² = a²/p [p divides a² so,p divides a]
Let a= pr for some integer r
→b² = (pr)²/p
→b² = p²r²/p
→b² = pr²
→r² = b²/p [p divides b² so, p divides b]
Thus p is a common factor of a and b.
But this is a contradiction, since a and b have no common factor.
This contradiction arises by assuming √p a rational number.
Hence,√p is irrational.

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ANSWER

A fair coin is tossed thrice find the probability of getting the same outcomes thrice?

Posted by Swarnima Dhabre 6 years, 10 months ago

CBSE > Class 10 > Mathematics

3 answers

Esha Pal 6 years, 10 months ago

Total outcomes = 2³ = 8 n(S) = { HHH, TTT, HHT, HTH, THH, TTH, THT, HTT } Favourable outcome = HHH, TTT P( getting the same outcome thrice ) = 2/8= 1/4.

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Mahi ✌?? 6 years, 10 months ago

1/4

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Rakesh Jha 6 years, 10 months ago

1/2

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ANSWER

The sum of first n terms

Posted by Satish Kumar 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Bhavya Vardhan Jain 6 years, 10 months ago

n/2(a+l) n/2(2a+(n-1)d)

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Kirti Dhillon 6 years, 10 months ago

n\2(2a+(n-1)d)

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ANSWER

hello any last minute tips

Posted by Akanksha Dutta 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Bahubali Gaming 6 years, 10 months ago

I think so? Our exam is on 7

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Bahubali Gaming 6 years, 10 months ago

Last minute??

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ANSWER

If the area of the segment AYB as shown in figure if the radius of the circle is 21cm and angle AoB =120°.

Posted by Khan Fardin 6 years, 10 months ago

CBSE > Class 10 > Mathematics

5 answers

Khan Fardin 6 years, 10 months ago

Bhai ncert example 3 ka question hai

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Khan Fardin 6 years, 10 months ago

Wrong answer

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Jyoti Laddha 6 years, 10 months ago

Area of segment =theta/360×pie ×r×r =120/360×22/7×21×21 =1/3×22×63 =462

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Khan Fardin 6 years, 10 months ago

Area of segment AYB sorry question me if ke jagah find hoga

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Ramesh Singh 6 years, 10 months ago

Bhai find kya karna h

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ANSWER

If BC=1/3 BC,prove 9 (AD×AD)=7 (AB×AB)

Posted by Skyadavskyadav Skyadavskyadav 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Ramesh Singh 6 years, 10 months ago

Yaa it is ncert que u should see in book

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Shivani Rawat 6 years, 10 months ago

Ncert ka question h toh dekh lo?

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ANSWER

From your pocket money , you save rupees 1 on day 1, rupees 2 on day 2 , rupees 3 on day 3 and so on. How much money will you save in the month of march 2008 ?

Posted by Ankit Prasad 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Rakesh Jha 6 years, 10 months ago

Rs 496

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Sankalp Awasthi 6 years, 10 months ago

Perhaps....496...rs

2Thank You

ANSWER

A theif run with uniform speed 100m per minute after 1 minute a policeman runs after the theif to catch him. He runs with speed of 100m per minute in the first minute and increase his speed by 10m per minute every minute. After hiw many minute police will catch the theif ??

Posted by Shivani Rawat 6 years, 10 months ago

CBSE > Class 10 > Mathematics

3 answers

Ramesh Singh 6 years, 10 months ago

6min

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Puja Sahoo? 6 years, 10 months ago

5 min

3Thank You

Sankalp Awasthi 6 years, 10 months ago

Perhaps after 21 min

3Thank You

ANSWER

Draw a tangent to a circle of radius 6 cm from a point P at a distance of 10 cm from its centre

Posted by Ruby Mathuria 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Vimal Muthu 6 years, 10 months ago

Answer is 6

2Thank You

Kirti Dhillon 5 years, 8 months ago

8cm

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ANSWER

points A(4,7) B(p,3) and C(7,3) are the vertices of right triangle, right angled at B.find the value of P

Posted by Priyanshu Singh 6 years, 10 months ago

CBSE > Class 10 > Mathematics

4 answers

Sankalp Awasthi 6 years, 10 months ago

Ya.....7 or 4....

1Thank You

Rakesh Jha 6 years, 10 months ago

P=3

0Thank You

Puja Sahoo? 6 years, 10 months ago

P=4 or p=7

2Thank You

Junali Gohain 6 years, 10 months ago

P= 3

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ANSWER

Ch.9 related question ex 6

Posted by Shivani Rawat 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Find the value of k for which the points are (3k-1,k-2) ,(k,k-7)and (k-1,k-2) are collinear

Posted by Priya Pardeshi 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Kirti Dhillon 6 years, 10 months ago

With formula of area of triangle which is =0

1Thank You

Kirti Dhillon 6 years, 10 months ago

K=0,3

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ANSWER

If the roots of the equation (a2 + b2 ) x 2 – 2(ac + bd) x + (c2 + d2 ) = 0 are equal, prove that a/b =c/d

Posted by Selma Ussan 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Kirti Dhillon 6 years, 10 months ago

Do with formula of D = b2 -4ac , also D=0 because root are equal ..

1Thank You

ANSWER

In your sample paper there are some small mistakes Please Check them.

Posted by Ritik Chauhan 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Prove that sum of the square of the side of a rhombus is equal to the sum of the square of its diagonal

Posted by Kajal Ranjan 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Ritik Chauhan 6 years, 10 months ago

its too easy

0Thank You

ANSWER

I should prefer ncrt or other reference book for examination..

Posted by Saswat Kumar 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Chetna ? 6 years, 10 months ago

NCERT ko ekdum bdiya tarike se kar loo ?kafi hai☺️

1Thank You

Anushka Jugran ? 6 years, 10 months ago

Firstly ncert then some other sample papers

3Thank You

ANSWER

Ch.9 related question

Posted by Shivani Rawat 6 years, 10 months ago

CBSE > Class 10 > Mathematics

4 answers

Shivani Rawat 6 years, 10 months ago

Please give me a answer

0Thank You

Shivani Rawat 6 years, 10 months ago

Example 6

1Thank You

Vikram Shukl 6 years, 10 months ago

Konsa questions chahiye

1Thank You

Shivani Rawat 6 years, 10 months ago

0Thank You

ANSWER

Sum of the area of two squares is 468m if the difference of their perimeter is 24 M find the side of the two squares

Posted by Yogesh Sharma 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Yogita Ingle 6 years, 10 months ago

Sum of the areas of two squares = 468 m²

Let a and b be the sides of the two squares.

⇒a²+ b² = 468…(1)

Also given that, the difference of their perimeters = 24m

⇒4a - 4b = 24

⇒a - b = 6

⇒a = b + 6…(2)

We need to find the sides of the two squares.

Substituting the value of a from equation (2) in equation (1), we have,

(b + 6)² + b²= 468

⇒b²+ 6² + 2 × b × 6 + b² = 468

⇒2b²+ 36 + 12b = 468

⇒2b²+ 36 + 12b - 468 = 0

⇒2b² + 12b - 432 = 0

⇒b² + 6b - 216 = 0

⇒b² + 18b - 12b - 216 = 0

⇒b(b + 18) - 12(b + 18) = 0

⇒(b + 18)(b - 12) = 0

⇒b + 18 = 0 or b - 12 = 0

⇒b = -18 = 0 or b = 12

Side cannot be negative and hence b = 12 m.

Therefore, a = b + 6 = 12 + 6 = 18 m.

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Kirti Dhillon 6 years, 10 months ago

12 and 18

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ANSWER

041 questions paper

Posted by Akshum Sharma 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Find the value of k for which one root of the quadritic equation kx2-14x+8=0 is 2

Posted by Subham Sarma 6 years, 10 months ago

CBSE > Class 10 > Mathematics

3 answers

Chetna ? 6 years, 10 months ago

Sorry it's k = 5 as ........28 - 8 = 20 nd.....,,,, 4k - 20=0 ......so,,,,,, k= 20/4=5 hence the value of k =5

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Chetna ? 6 years, 10 months ago

x =2 so ,,,,_______ k(2^2) - 14^2 + 8 = 4k - 36=0 ,,,,,,,, 4k =36 = k =36/4 = 9 ...........so the value of k = 9

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Kirti Dhillon 6 years, 10 months ago

K=5

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ANSWER

If nth term of A.P. is (2n+1), what is the sum of its first three terms ?

Posted by Subham Sarma 6 years, 10 months ago

CBSE > Class 10 > Mathematics

3 answers

Kirti Dhillon 6 years, 10 months ago

Lakin mera ta 15 aya hai

0Thank You

Sannidhya Tyagi 6 years, 10 months ago

Nth term =2n+1 Now put n=1 2*1+1=3 ..............1 Now put n=2 2*2+1=5 ..............2 From 1 and 2 we have a=3 D=5-3=2 Using formula Sn=n/2(2a+(n-1)d) Sn=3/2(2×2+(3-1)*2) Sn=3/2(4+4) Sn=3/2*8 Sn=3*4 Sn =12 The required Sn is 12

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Kirti Dhillon 6 years, 10 months ago

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ANSWER

Solve the pair of equations by reducing them to a pair of linear equations : 5/x-1+1/y-2=2 6/x-1-3/y-2=1

Posted by Junali Gohain 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Kirti Dhillon 6 years, 10 months ago

x=4 and y=4

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ANSWER

Choose whether the pairs are consistent or inconsistent 1) 3x+2y=5, 2x+3y=5 2) 2x-3y=7, 2x-3y=8

Posted by Junali Gohain 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Lamha Kishore 6 years, 10 months ago

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ANSWER

If m times the Mth term of an Ap is equal to n times the Nth term [and m is not equal to n] show that its [m+n]th term is zero.

Posted by Arpit Tiwari 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Plz send me.imp. question for board point of view

Posted by Manish Semlawat 6 years, 10 months ago

CBSE > Class 10 > Mathematics

5 answers

Nitin Dadhich 6 years, 10 months ago

Important question are:- Prove irrational.. HCF is given and find LCM.. Relationship between zeroes.. Solve word equestion... Find nth term and all ... Find variable in coordinate geometry.. Trignometrys small questions.. Triangle construction... Prbability.. Convert to less and more than ogive..

2Thank You

Anushka K 6 years, 10 months ago

You tube me h

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Anushka K 6 years, 10 months ago

Aap video download karo bhaskar sir ka. May be wo aa jaye Kyuki Jo bhi btaye question h wo sab important hai

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Rohit Shetty 6 years, 10 months ago

7 ko to board h to abhi oswal le kar kya karega

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Nitin Kumar?Hr35 Vala?(Narnaul)? 6 years, 10 months ago

Bhai oswal le le

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ANSWER

If -5 is a root of equation 2x square+ px -15=0 and p(x square+x)+k=0 has equal roots.Find value of k

Posted by Krishna Parashar 6 years, 10 months ago

CBSE > Class 10 > Mathematics

4 answers

Nitin Dadhich 6 years, 10 months ago

-140 is the value of K

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Abhay Modi 6 years, 10 months ago

As -5 is a root of the equation 2x^2+px-15=0 so it is also a root of the equation p(x^2+x)+k=0 Now, 2x^2+px-15=0 =>2(-5)^2+p(-5)-15=0 =>2×25-5p-15=0 =>50-5p-15=0 =>35-5p=0 =>-5p=-35 =>5p=35 =>p=7 Now,putting p=7 and x=-5 in the equation p(x^2+x)+k=0, we get, p(x^2+x)+k=0 =>7{(-5)^2+(-5)}+k=0 =>7(25-5)+k=0 =>7×20+k=0 =>140+k=0 =>k=-140

2Thank You

Aditya Sharma Sarswat 6 years, 10 months ago

Not sure but shayad k = √5/4

1Thank You

Karan Kumar 6 years, 10 months ago

Take x = -5

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