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:

Nishant Verma

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

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

= 10p²q² - 10p²q² + 5pq + 20

= 5pq + 20

-Answered by Nishant Verma On 17 October 2019:02:37:38 PM

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:

Akki chauhan

( 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 Akki chauhan On 05 September 2019:08:41:17 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:

Nishant Verma
The value of a²= 2²

The value of b²= (-2²) = 4

a²+b²= 4+4

= 8

-Answered by Nishant Verma On 17 October 2019:02:38:02 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:

Nishant Verma

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 Nishant Verma On 17 October 2019:02:38:41 PM

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:

Master Purushottam

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 Master Purushottam On 22 August 2019:08:55:23 PM

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