Question

Select the expression that is equivalent to (x+4)^2

a. x^2 + 8x + 16
b. x^2 +4x + 16
c. 2x + 8x + 16
d. x^2 + 8x^2 + 16

Help please, thank you so much

Answer 1

(x+4)^2 is the same as (x+4)(x+4)

To factorise this quadratic:

x multiplied by x = x^2
x multiplied by 4 = 4x
4 multiplied by x = 4x
4 multiplied by 4 = 16

So x^2+4x+4x+16
Simplify: x^2+8x+16

So I think the answer is A.

(I’M SO SORRY IF I’M WRONG BTW)