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

Let digit at unit’s place = x and digit at hundred’s place = y
{tex}\therefore{/tex} Middle digit ={tex} x + y + 1{/tex}
Number = {tex}100y + 10(x + y + 1) + x{/tex}
Number obtained by reversing the digits = {tex}100x + 10(x + y + 1) + y{/tex}
ATQ.,
{tex}x + y + (x + y + 1) = 17{/tex}
{tex}\Rightarrow{/tex} {tex}2x + 2y = 16{/tex} ..(i)
and {tex}100x + 10(x + y + 1) = x - 396{/tex} ..(ii)
{tex}\Rightarrow{/tex} {tex}99x - 99y = -396{/tex}
{tex}\Rightarrow{/tex} {tex}x - y = -4{/tex}
By Solving equation (i) and (ii), we get
x = 2, y = 6 and Number = 692

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Examine whether (3-√2)(3+√2) is a rational or irrational

Posted by Chanchal Bhardwaj 7 years, 5 months ago

CBSE > Class 10 > Mathematics

3 answers

Alok Alok 7 years, 5 months ago

Rational Number

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Monu Monu 7 years, 5 months ago

Rational no.

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Parteek Parteek 7 years, 5 months ago

Rational

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Two dice are thrown simultaneously . What is the probability of getting a)a doublet b)sum of 7 c)a sum of 11or 12 d)3on first die e) product of 6 f)prime number on second die

Posted by Karan Singh 7 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

Aman Lohiya 7 years, 5 months ago

E=1/9

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Aman Lohiya 7 years, 5 months ago

A=1/6 B=1/6 C1/12 D=1/6 E=11/9 F=1/4

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ANSWER

Sovle by quadratic formula.... 4 x square + 4b x minus (a square minus b square)=0

Posted by Shafi Moznur Ahmed 7 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Previous year questions

Posted by Rahul Kumar 7 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

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√45 +7√45

Posted by Aditya Kumar 7 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

..... ...... 7 years, 5 months ago

24√5

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Gandham Cherishma 7 years, 5 months ago

6√5+7

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ANSWER

The hcf of 441,567,693by using Euclid's division algorithm

Posted by Deepak Kesari 7 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

How can we identify whether root 2 is irrational

Posted by Bhoomi Garg 7 years, 5 months ago

CBSE > Class 10 > Mathematics

3 answers

Anchal Singh 7 years, 5 months ago

Let Us assume that root 2 is a rational no. Than, exist of Co-prime a and b. B is not equal to zero Root 2 = a/b Since a/b is rational no. But root 2 is irrational no so root 2 is irrational no.

1Thank You

Amar Nagargoje 7 years, 5 months ago

See NCERT pg no-12

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Goutam Kumar Kushwaha 7 years, 5 months ago

Lat wrong assumption

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Sin73+sin17

Posted by Narendar Gupta 7 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Ayush Dalmia 7 years, 5 months ago

sin(90-17)+sin17 cos17+sin17

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(a+b)2x2-4abx-(a-b)2=0

Posted by Ritika Thakur 6 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 6 months ago

We have,
{tex}(a + b)^2x^2 - 4abx - (a - b)^2 = 0{/tex}
In order to factorize {tex}(a + b)^2x^2 - 4abx - (a - b)^2{/tex}, we have to find two numbers 'l' and 'm' such that.
l + m = -4ab and lm = -(a + b)²(a - b)²
Clearly, (a - b)² + [-(a + b)²] = -4ab and lm = -(a + b)²(a - b)²
l = (a - b)² and m = -(a + b)²
Now,
{tex}(a + b)^2x^2 - 4abx - (a - b)^2 = 0{/tex}
{tex}\Rightarrow{/tex} {tex}(a + b)^2x^2 - (a + b)^2x + (a - b)^2x - (a - b)^2 = 0{/tex}
{tex}\Rightarrow{/tex} (a + b)²x [x - 1] + (a - b)²[x - 1] = 0
{tex}\Rightarrow{/tex} (x - 1)[(a + b)²x + (a - b)²] = 0
{tex}\Rightarrow{/tex} x - 1 = 0 or (a + b)²x + (a - b)² = 0
{tex}\Rightarrow{/tex} x = 1 or {tex}x = - \frac{{{{(a - b)}^2}}}{{{{(a + b)}^2}}}{/tex}

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What is the formulae of sin a

Posted by Shuvanshu Rai 7 years, 5 months ago

CBSE > Class 10 > Mathematics

4 answers

Anchal Singh 7 years, 5 months ago

P/ h

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Amar Nagargoje 7 years, 5 months ago

P/h

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Nikki Kushwah 7 years, 5 months ago

Perpendicular /Hypotenus P/H

1Thank You

Arpit Singh 7 years, 5 months ago

perpendicular/hypotenus

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ANSWER

If the sum of first nth terms of an ap is 3n^2-2n. Find the A.P. and its 18th terms.

Posted by Akanksha Singh 7 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Solutions for 6x+10y=4,3x+5y=-11

Posted by Nikita Sontakke 7 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Kushagra Kumar Ghai 7 years, 5 months ago

6x+10y-4=0..............eq1
3x+5y+11=0.............eq2
now subtract eq2 from eq1
gives 3x+5y=-14.............eq 3
hat is not possible so i recommend u to recheck the question

5Thank You

ANSWER

what is the standard form in linear equations in two variables

Posted by Sujana Vemula 7 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Kushagra Kumar Ghai 7 years, 5 months ago

ax+by+c=0

1Thank You

ANSWER

(3/x+1)+(4/2 (x-2))=23/5x find the roots

Posted by Pradeep Rajeshkumar 7 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Sanjana Yadav 5 years, 8 months ago

Hello....

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999999999999999×9999999999999999×999999999999999999999×9999999999999999999×999999999999 (99999999 (9999999 ((99999999))))

Posted by Pradeep Rajeshkumar 7 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

Madhan Saravanakumar 7 years, 5 months ago

1e99

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Sanjana Yadav 7 years, 5 months ago

Pagal

2Thank You

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Students of a class are made to stand in rows. If one student is extra in a row, there would be 2 rows less. If one student is less in a row there would be 3 rows more. Find the number of the students in the class

Posted by Shobhit Mittal 7 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Susmit Mishra 7 years, 5 months ago

2Thank You

ANSWER

What is polygon triangle

Posted by Rahul Soren 7 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Solve for x and y x+y=a+b and ax+by=a^2+b^2

Posted by Shobhit Mittal 7 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

A shopkeeper gives books on rent for reading. She takes a fixed charge for the first two days and an additional charge for each day thereafter. Latika paid Rs. 22 for a book kept for six days, while Anand paid Rs. 16 for the book kept for 4 days. Find the fixed charges and the charge for each extra day

Posted by Shobhit Mittal 7 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

Mh Kamali 7 years, 5 months ago

Let the fixed charge for 1st two days is Rs.x and additional charge for each day is Rs.y For Latika, A/q x+5y=22 ------(1) For Anand, Also, x+3y=16 ------(2) On subtracting equation (2) from equation(1) We get, (x+5y)-(x+3y)=22-16 => x+5y-x-3y=6 => 2y=6 => y=6/2 =>y=3 Now, put value of y in equation (2) x+3×3=16 => x+9=16 => x=16-9 => x=7 Hence, fixed charge for 1st two days is Rs.7 and charge for each day is Rs.3

1Thank You

Sohan Pavan 7 years, 5 months ago

Let the fixed charge be x and let the additional charge be y

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Which all chapters have been removed in cbse class 11th mathematics this year(2018-19)?

Posted by Sneha Dubey 7 years, 5 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Find the product of roots of a quadratic equation 2x^2+7x-4

Posted by Sivani Jayanadh 7 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Arpit Singh 7 years, 5 months ago

-2

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Who was Thales

Posted by Saurav Sharma 7 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 6 years, 6 months ago

Thales is credited with the following five theorems of geometry:

A circle is bisected by its diameter.
Angles at the base of any isosceles triangle are equal.
If two straight lines intersect, the opposite angles formed are equal.
If one triangle has two angles and one side equal to another triangle, the two triangles are equal in all respects. (See Congruence)
Any angle inscribed in a semicircle is a right angle. This is known as Thales' Theorem.

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Find the zeros of the quadratic polynomial f(x) =x ^2 +5x - 6 & verify the relation between the zeros & its coefficient

Posted by J Lacy Gloss Rapper 7 years, 5 months ago

CBSE > Class 10 > Mathematics