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Example 9 of chapter 13

Posted by Rekha Vyas 6 years, 9 months ago

CBSE > Class 10 > Mathematics

0 answers

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How many terms of the AP: 9,17,25,.... must be taken to give a sum of 636

Posted by Yash Sharma ?? 6 years, 9 months ago

CBSE > Class 10 > Mathematics

5 answers

Yogita Ingle 6 years, 9 months ago

First term of A.P. = 9 , common difference = 8
if sum of n terms 636, Sn = (n/2) [ 2×9 + (n-1)8 ] = 636
Sn = n [ 10+ 8n] = 1272
8n² +10n -1272 = 0
4n² +5n -636 = 0
By factorising LHS,
(4n+53)(n-12) = 0
hence n = 12

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Sankalp Awasthi 6 years, 9 months ago

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Guddan_ ?? 6 years, 9 months ago

2Thank You

Puja Sahoo? 6 years, 9 months ago

12 terms should be taken

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Honey ??? 6 years, 9 months ago

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2 cubes each of volume 64cm cubes are joined end to end.find the surface area of resulting cuboid

Posted by Faiz Saikh 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Ritesh Barnwal 6 years, 9 months ago

Vol=64cm^3=> a^3=4^3=>a=4 l=8 b=4 h=4 TSA=2(lb+bh+hl) => 2(32+16+32) => 2(64+16) => 2×80 => 160cm^2

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Honey ??? 6 years, 9 months ago

160 cm sq

6Thank You

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If sec thita -tan thita =x Show that sec thita +tan thita =1/x

Posted by Ankit Mishra 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Vaibhav Yadav 6 years, 9 months ago

Multiply (sec theta - tan theta) with (sec theta + tan theta)/(sec theta + tan theta). This will give you x=reciprocal of(sec theta + tan theta). Thus 1/x= sec theta + tan theta

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If the difference between two numbers is 26, and one number is three times the other. Find them

Posted by Tago Asker 6 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Guddan_ ?? 6 years, 9 months ago

13 and 39

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Sankalp Awasthi 6 years, 9 months ago

13 and 39

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Puja Sahoo? 6 years, 9 months ago

13 and 39.....

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The points A(1,-2) B (2,3) ,C (k ,2) are D (-4,'-3) are the vortices of a parallelogram find the value of k

Posted by Shikha Kanojiya 6 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Honey ??? 6 years, 9 months ago

Simply, do X1+ X3-X2=X4 and same as for Y coordinate

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Sankalp Awasthi 6 years, 9 months ago

Ya -3....

1Thank You

Honey ??? 6 years, 9 months ago

-3

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Q.Three digit number are made using the digits 4,5,9 (without repetition).If a number among them is selected at random,what is the probability that the number Will: (i) be a multiple of 5? (ii)be a multiple of 9? (iii)will end with 9?

Posted by Megha Kumari 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Wasim Zafar 6 years, 9 months ago

(1)– 1/3 (2)-1/3 (3)-1/3

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N,l,and m are the length of the sides LM, MN and NL, respectively of a right angled triangle LMN . If r is the radius of the incircle , then prove that 2r=( n+l-m)

Posted by Harshita Singh Jaat 6 years, 9 months ago

CBSE > Class 10 > Mathematics

0 answers

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Derivation of values of trigonometric table of angles 30, 45 ,&60

Posted by Muskan Ojha 6 years, 9 months ago

CBSE > Class 10 > Mathematics

0 answers

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(secA+tanA)(secB+tanB)(secC+tanC)=(secA-Tan)(secB-tanB)(secC-tanC) Each side equal to +-1

Posted by Yunus Abbasi 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Muskan Ojha 6 years, 9 months ago

Its*

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Muskan Ojha 6 years, 9 months ago

Multiply last by itsome conjicuate

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show graphically the pair of linear equation is parallel or not to X - 2y - 2 is equals to zero and 3 x minus 3 Y + 5 is equals to zero

Posted by Hrishika Bishnoi 6 years, 9 months ago

CBSE > Class 10 > Mathematics

0 answers

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Two cubes have their volumes in the ratio 1:7 find the ratio of theirsurface areas

Posted by Priyanshu Singh 6 years, 9 months ago

CBSE > Class 10 > Mathematics

0 answers

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X-y=3 3x-2y=10

Posted by Jayant Singh 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Wasim Zafar 6 years, 9 months ago

X-Y=4, x=4+y(1) 3x-2y=10 3(4+y)-2y=10. from1 12+3y-2y=10 Y=-2 From1, X=4+(-2) =2 X=2, y=-2

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Ravindranath Bhosale 6 years, 9 months ago

X=4 y=1

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Find the 2 number whose sum is 27 and product is 182

Posted by Harwinder Kaur 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Yash Sharma ?? 6 years, 9 months ago

14 and 13

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Gagan Kaur 6 years, 9 months ago

Let fitst number be x and second be 27+x According to given condition X(27+×) =182 27×+×2 -182 ×2-13×-14×-182 ×(×-13)-14(×-13) (×-13)(×-14) ×=13,×=14

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What is campleting square method

Posted by Badalsingh Parihar 6 years, 9 months ago

CBSE > Class 10 > Mathematics

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Find the zeros of the quadratic polynomials of 5x2-4-8x and verify the relationship between the zeros and the coefficient

Posted by Yash Raj 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Zakir Ali 5 years, 8 months ago

-2,

1Thank You

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if sin thrita=a/b,then find cos thrita

Posted by Arsh Wander 5 years, 8 months ago

CBSE > Class 10 > Mathematics

1 answers

Pokemon Pro 6 years, 9 months ago

Cos tita is b-a/b

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5(25)+5-6=6

Posted by Karma Desang 6 years, 9 months ago

CBSE > Class 10 > Mathematics

0 answers

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Is it compulsory that pouch should be transparent

Posted by Priyanshi Mishra 6 years, 9 months ago

CBSE > Class 10 > Mathematics

4 answers

Affu 😊 6 years, 9 months ago

Yes , it is written in admit card..If you don't have then buy it

1Thank You

Garima Choudhary 6 years, 9 months ago

Yes it is wrritten on admit card

2Thank You

Devansh Rai 6 years, 9 months ago

Yes it is compulsory plus transparent bottle also

1Thank You

Abhishek Singh 6 years, 9 months ago

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Is clipboard and pouch are allowed in board?

Posted by Kabir Saroha 6 years, 9 months ago

CBSE > Class 10 > Mathematics

4 answers

Garima Choudhary 6 years, 9 months ago

Ya both are allowed but they both should be transparent

0Thank You

कबीर गुर्जर अभिषेक का दसवाँ बाप 6 years, 9 months ago

Re nawab mera naam bhi Kabir hai..... Kabir Baisla (Bansal)

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Harshita Srivastava 6 years, 9 months ago

Yes but both should be transparent.

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#Aditi~ Angel???? 6 years, 9 months ago

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blue print for 2019 exam of cbse 10

Posted by Tushar Malik 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

#Aditi~ Angel???? 6 years, 9 months ago

It's given in cbse.nic websites or in anyoth3r websites

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Two tangent RQ and RP are drawn from an external point R to the circle with center O. If angle PRQ = 120 , then prove that OR = PR + RQ.

Posted by Aayushi Gurjar 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Vanshika Mittal 6 years, 10 months ago

Cos 60= PR/OR 1/2 = PR/OR OR= 2PR - - - - - - - - - (1) IN TRIANGLE QRO COS60 = RQ/OR 1/2= RQ/OR 2RQ= OR-----------(2) ADDING BOTH, OR+OR = 2PR + 2RQ OR= PR + RQ HENCE PROVED

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a^3-b^3 =

Posted by Karan Sharry 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Hiru ? 6 years, 9 months ago

(a-b)(a²+ab+b²)

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Prove that in a triangle the side opposite to the similar tiangle is equal to two-third of that triangle

Posted by Debashis Debnath 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Debashis Debnath 6 years, 10 months ago

Not possible

2Thank You

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Check whether -150 is a term of the ap 11,8,5,2.....

Posted by Memo Yadaw 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Devansh Rai 6 years, 9 months ago

Ncert solution

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3 cubes of a metal whose edges are in the ratio 3:4:5 are melted and converted into a single cube whose diagonal is 12root3 cm. Find edges of the 3 cubes.

Posted by Ship.. ??? 6 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 4 months ago

Given, Three cubes of a metal whose edges are in the ratio 3 : 4 : 5{tex}{/tex}.So,we can take the edges of these cubes as 3x, 4x and 5x.
Volume of the cones are, (3x){tex}^3{/tex}, (4x){tex}^3{/tex},(5x){tex}^3{/tex} i.e 27x{tex}^3{/tex}, 64x{tex}^3{/tex}, 125x{tex}^3{/tex}.
We know that,
the length of the diagonal of a single cube of side {tex}a = a \sqrt { 3 }{/tex}
The length of the diagonal of a cube is given to be {tex}12 \sqrt { 3 }.{/tex}
So, the edge of a single cube is 12 cm.
Volume of the single cube = (12)³ = 1728 cm³
Since the three cubes are melted and converted into a single cube,
Sum of the volumes of the three cubes = Volume of a single cube
{tex}\Rightarrow{/tex} 27x³+ 64x³ + 125x³ {tex}=1728{/tex}
{tex}\Rightarrow{/tex} 216x³ {tex}= 1728{/tex}
{tex}\Rightarrow{/tex} x³ = 8
{tex}\Rightarrow{/tex} {tex}x = 2 \ cm{/tex}
So, the edges of the cubes are 6 cm, 8 cm and 10 cm.

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If cosecA+cotA=m And cosecA-cotA=n Then prove that mn=1.

Posted by Nisha Sandhu (Super Cool) 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Ishit__ __? 6 years, 10 months ago

mn=(cosecA+cotA)(cosecA-cotA) =>cosec²A-cot²A =>1

1Thank You

Nisha Sandhu (Super Cool) 6 years, 10 months ago

Someone give me answer

0Thank You

ANSWER

Sample paper buy nhi ho rahe hai ise app ke

Posted by Harsh Rajpoot 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

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xsin³A+ycos³A=sinA.cosA and xsinA=ycosA Prove that x²+y²=1

Posted by Suman Chimpa 6 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 4 months ago

We have,
xsin³{tex}\theta{/tex} + ycos³{tex}\theta{/tex} = sin{tex}\theta{/tex} cos{tex}\theta{/tex}
{tex}\Rightarrow{/tex} (xsin{tex}\theta{/tex}) sin²{tex}\theta{/tex} + (ycos{tex}\theta{/tex}) cos²{tex}\theta{/tex} = sin{tex}\theta{/tex} cos{tex}\theta{/tex}
{tex}\Rightarrow{/tex} x sin{tex}\theta{/tex} (sin²{tex}\theta{/tex}) + (x sin{tex}\theta{/tex}) cos²{tex}\theta{/tex} = sin{tex}\theta{/tex} cos{tex}\theta{/tex} [{tex}\because{/tex} x sin{tex}\theta{/tex} = y cos{tex}\theta{/tex}]
{tex}\Rightarrow{/tex} x sin{tex}\theta{/tex} (sin²{tex}\theta{/tex} + cos²{tex}\theta{/tex}) = sin{tex}\theta{/tex} cos{tex}\theta{/tex}
{tex}\Rightarrow{/tex} x sin{tex}\theta{/tex} = sin{tex}\theta{/tex} cos{tex}\theta{/tex}
{tex}\Rightarrow{/tex} x = cos{tex}\theta{/tex}
Now, xsin {tex}\theta{/tex} = ycos{tex}\theta{/tex}
{tex}\Rightarrow{/tex} cos{tex}\theta{/tex} sin{tex}\theta{/tex} = y cos{tex}\theta{/tex} [{tex}\because{/tex} x = cos{tex}\theta{/tex}]
{tex}\Rightarrow{/tex} y = sin{tex}\theta{/tex}
Hence, x² + y² = cos²{tex}\theta{/tex} + sin²{tex}\theta{/tex} = 1