Question

Choose the correct product of (2x + 10)2.

4x2 − 100
4x2 + 40x + 100
4x2 + 100
4x2 − 40x + 100

Answer 1

`(2x+10)^2=4x^2+40x+100`

Explanation:

Given the expression

`(2x+10)^2`

we have to simplify the above expression.

By identity

`(a+b)^2=a^2+2ab+b^2`

Put a=2x and b=10

`(2x+10)^2=(2x)^2+2(2x)(10)+10^2`

`(2x+10)^2=4x^2+40x+100`

Option B is correct.

Answer 2

Answer: 4x² + 40x +100

(2x+10)(2x+10)
4x2 + 20x + 20x +100
4x2 + 40x + 100