Asked/Added Questions From NCERT:

Question 1. Asked on :07 January 2019:02:26:38 PM

Find the sum : 3p²q² - 4pq + 5, - 10p²q², 15 + 9pq + 7p²q²

-Added by Master Purushottam Mathematics » Algebra Expreesion

Answer:

Akki chauhan

3p²q² - 4pq + 5 + (-10p²q²) + 15 + 9pq + 7p²q²

= 3p²q² + 7p²q² - 10p²q² + 9pq - 4pq + 5 + 15

= 10p²q² - 10p²q² + 5pq + 20

= 5pq + 20 Answer

-Answered by Akki chauhan On 10 January 2019:10:54:27 AM

Question 2. Asked on :07 January 2019:02:17:56 PM

Putting x = 2 (i) In x + 4, we get the value of x + 4, i.e., x + 4 = 2 + 4 = 6

-Added by Master Purushottam Mathematics » Algebra Expreesion

Answer:

Himanshi Verma

( x + 1/x)² = x² + 1/x² + 2

=> 2² = x² + 1/x² + 2

=> x² + 1/x² = 4–2 = 2 . . . . . . . .(1)

(x - 1/x)² = x² + 1/x² -2

=> ( x-1/x)² = 2 - 2 = 0

=> (x-1/x) = 0 . . . . . . . . . .(2)

Now, x^4 - 1/x^4 = ( x² + 1/x²) ( x² - 1/x²)

= 2 ( x + 1/x) ( x-1/x)

= 2 * 2 * 0 ( by (1) & (2)

= > x^4 - 1/x^4 = 0

-Answered by Himanshi Verma On 22 March 2019:05:16:46 PM

Question 3. Asked on :07 January 2019:02:16:52 PM

If a = 2, b = -2, find the value of a² + b².

-Added by Master Purushottam Mathematics » Algebra Expreesion

Answer:

Himanshi Verma
The value of a²= 2²

The value of b²= (-2²) = 4

a²+b²= 4+4

= 8

-Answered by Himanshi Verma On 22 January 2019:05:38:40 PM

Question 4. Asked on :07 January 2019:02:15:12 PM

. Simplify the expressions and find the value if x is equal to 2
(i) x + 7 + 4 (x – 5)

-Added by Master Purushottam Mathematics » Algebra Expreesion

Answer:

Akki chauhan

x+7+4(x-5)=2

x+7+4x-20=2

5x-13=2

5x=2+13

5x=15

x=3

So, The value of x is 3.

-Answered by Akki chauhan On 14 January 2019:10:15:24 AM

Question 5. Asked on :07 January 2019:02:14:21 PM

simplify the expression and find its value when a = 5 and b = -3.
2(a² + ab) + 3 - ab

-Added by Master Purushottam Mathematics » Algebra Expreesion

Answer:

Himanshi Verma

a=5, b=-3

2(5²+5×(-3))+3-5×(-3)

2(25+(-15))+3+15

2(25-15)+18

2×10+18

20+18

-Answered by Himanshi Verma On 10 March 2019:04:58:49 PM

You can see here all the solutions of this question by various user for NCERT Solutions. We hope this try will help you in your study and performance.

This Solution may be usefull for your practice and CBSE Exams or All label exams of secondory examination. These solutions or answers are user based solution which may be or not may be by expert but you have to use this at your own understanding of your syllabus.