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The answer is Let 3+2√2 be a rational number and it can be written in the form of : p/q = 3+2√2 p/q -3 = 2√2 p-3q / q =2√2 Rational = irrational Therefore our assumption was wrong. Hence 3+2√2, is an irrational number.

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Find to consecutive positive integers sum of whose squares is 421

Posted by Roshni . 10 months, 2 weeks ago

CBSE > Class 10 > Mathematics

1 answers

Kaushik Verma 10 months, 2 weeks ago

x²+(x+1)²=421 x²+x²+1+2x=421 2x²+2x=420 2x²+2x-420=0 2(x²+x-210)=0 x²+x-210=0 D=b²-4ac =1²-4×1×(-210) =1+840 =841 underoot841=29 x=14 x=-15(it is neglected)

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Find two numbers whose sum is 25 and product is 156

Posted by Roshni . 10 months, 2 weeks ago

CBSE > Class 10 > Mathematics

1 answers

Spoorti Izare 10 months, 2 weeks ago

X=13 and 12 and y= 13 and 12

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If the sum of first 7 term of an ap is 49 and that of 17 term is 289 find the sum of first n terms.

Posted by Kashish Bhardwaj 10 months, 2 weeks ago

CBSE > Class 10 > Mathematics

5 answers

Deepanshu Garg 10 months, 2 weeks ago

It's ok bro

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Abhinav Raj Singh 10 months, 2 weeks ago

its ok brother

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Naman Sisodiya 10 months, 2 weeks ago

Thank

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Abhinav Raj Singh 10 months, 2 weeks ago

S7 = 7/2{2a+(n-1)d} => 49= 7/2{2a+(n-1)d} => 14= 2a + (7-1)d =>14 = 2a +6d => a + 3d = 7 ---------------(dividing by 2) => a = 7-3d -----------------(i) for S17:- S17 = 17/2 {2a+(n-1)d} => 289= 17/2 {2a+(17-1)d} => 34 = 2a + 16d => a = 17- 8d ---------------(ii) by eq(i) and eq(ii):- 17 - 8d = 7-3d =>10=5d =>d=2 again by eq(i):- a =1 by Sn:- Sn = n/2 {2a+(n-1)d} =>Sn = n/2{2+(n-1)2} => Sn = n + n^2 - n => Sn = n^2

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Abhinav Raj Singh 10 months, 2 weeks ago

n^2

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If the sum of first 7 term of an ap is 49 and that of 17 term is 289 find the sum of first n terms.

Posted by Kashish Bhardwaj 10 months, 2 weeks ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Mukesh want to distribute ice cream which is in a container shaped like a right circular cylinder having diameter 18 cm and height 15 CM the ice cream is to be filled into cons of height 8 cm and diameter 5 cm use having spherical and on the top find the exact number of such cons which can be fully filled with ice cream (use theta is equals to 3.14)

Posted by Gayatri Meghwal 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

0 answers

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And all tanker is having metallic tank in the form of the right circular cylinder with the hemispherical ends if the height of the cylinder is 10 m and diameter of the circle section is 4 m to save it from rust it is to be painted find the cost of painting the solid at the rate of rupees 10 for 1 square CM of the area( used by is equals to 3.14)

Posted by Gayatri Meghwal 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

1 answers

Kaushik Verma 10 months, 2 weeks ago

TSA Of tank= CSA of Cylinder +2×CSA Of Hemisphere = 2pirh+4pir² =2pir(h+2r) =2×3.14×2(10+4) =4×3.14×14 =56×3.14 175.84m² ( 17584cm²) Cost of painting = 10×17584=175840cm²

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The mode of a grouped frequency distribution is 75 and the modal class is 65-80.The frequency of the class preceding the modal class is 6 and the frequency of the class succeeding the modal class is 8.Find the frequency of the modal class.

Posted by Kaushik Verma 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Find the value of k for which the quadratic equation 2x²-kx+k=0

Posted by Kanta Sha 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

2 answers

Kaushik Verma 10 months, 3 weeks ago

D=b²-4ac=0 =k²-4×2×k=0 = k²-8k=0 =k(k-8)=0 = k-8=0 =k=8

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Aniket Singh 10 months, 3 weeks ago

Given : b²-4ac=0 So, (-k)²-4×2×k=0 k²-8k=0 k(k-8)=0 k=8

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-2+5+8________ +x = 155

Posted by Savitoj Kaur 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

1 answers

Abhinav Raj Singh 10 months, 2 weeks ago

d is the common difference and a is the first term this series forms A.P. as it has common difference and a2-a1 = a3-a2=3 d =a2-a1 = 3 a =2 and given Sn = 155 also Sn =n/2 {2a+(n-1)d} => 155 = n/2{ 4 + (n-1)3} => 310= 4n +3n^2 - 3n => 3n^2 +n -310 =0 => 3n^2 -30n +31n -310 =0 =>3n(n-10)+31(n-10)=0 =>(3n+31)(n-10)=0 since number of terms (n) cant be negative so n=10

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The sum of ages of Anup and his father is as old as his father. Now, he will be 5 times as old as his son Anuj is now, Anuj will be 8 year older than Anup is now, when Anup is as old as his father. What are their ages now ?

Posted by Sakshi ᑭᗩᑎᗪ乇Y 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Find the zeros of polynomial 2x² - 16

Posted by Khushi Farkya 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

2 answers

Kaushik Verma 10 months, 3 weeks ago

2x²-16=0 2(x²-16)=0 x²-16=0 x²=16 x=+4 x=-4

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Tanuj Bera 10 months, 3 weeks ago

2x²-16 (√2x)²-(4)² (√2x-4)² that's the answer

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Rspl/ead/mock paper solution class 10

Posted by Rashmeet Kaur 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Find the point on the y-axis which is equidistant from the point (6,5)and(-4,3)

Posted by Aryan Chaurasiya 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

2 answers

Bhupendra Kumar Singh 10 months, 3 weeks ago

√(0-6)^2+(5-y)^2=√(-4-0)^2+(3-y)^2 =>36+25+y^2-10y=16+9+y^2-6y=>61+y^2-10y=25+y^2-6y=>36-4y=0........y=9..... required coordinates are (0,9)

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Abhishek Kumar Ranjan 10 months, 3 weeks ago

=> cood.of y=(0,y) . => Cood.of y=(-4+6/2 , 3+5/2). =( 1,4) On comparing, (1=0, 4=y) Cood.of y=(0,4)

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Solution of basic sample paper 1

Posted by Raj Kumar 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

2 answers

Mangu Singh J 10 months, 3 weeks ago

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Bharatram Gurjar 10 months, 3 weeks ago

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Survey it is found that every fifth person what is the probability of person not processing the vehicle

Posted by Mohammed Jubair 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

1 answers

S Aashay 10 months, 3 weeks ago

question pura type karo!!

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If the pth term of an a.p.is 1/q and qth term of an a.p. is 1/q then show that its (pq)th term is 1 ?

Posted by Kashish Bhardwaj 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

1 answers

S Aashay 10 months, 3 weeks ago

hence proved!!

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A metallic cube of edge 1 cm is melted into a wire of diameter 4 mm then find the length of the wire

Posted by Jaskirat Singh Grewal 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

1 answers

Lake River 10 months, 3 weeks ago

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From the top of a 7 m high building,the angle ot elevation of the top of a cable tower is 60° and the angle of depression of its foot is 45°. Determine the height of tower.

Posted by Arush Negi 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

2 answers

Lakshdeep Vashisth 10 months, 3 weeks ago

7(√3-1)

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Amarnath Shukla 10 months, 3 weeks ago

7(√3+1)m

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The volume of hemisphere 24hemisphere 2425 and 1/2 find the carverd surface

Posted by Karrii Vijay 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

1 answers

Aneek Bera 10 months, 3 weeks ago

Rewrite the question

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ANSWER

Find median class

Posted by Hm The Boss 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics

4 answers

Kanu Choudhary 10 months, 3 weeks ago

Upper limit+ lower limit divided by 2

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Aman Poonia 10 months, 3 weeks ago

L+(f1+f2/2f1-f2-f3)*H

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Rajat Tanna 10 months, 2 weeks ago

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Ayush Dubey 10 months, 3 weeks ago

2+3

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Practice for mental maths important questions

Posted by Ishta Mahour 10 months, 3 weeks ago

CBSE > Class 10 > Mathematics