Question

Explain how to multiply (x+4) to the 2 power

Answer 1

x²+8x+16

Explanation:

(x+4)² = (x+4) (x+4) = x² + 4x +4x + 16

= x²+8x+16

You can also use (a+b)² formula for expansion

(a+b)² = a² + 2ab + b²

Answer 2

x^2 + 8x + 16

Explanation:

x^y

an exponent is the the value of x, multiplied by x, for y times.

so, (x+4)^2 is the same as (x+4)*(x+4). Then you just simplify using FOIL.

F-first x*x = x^2

O-outer x*4 = 4x

I-inner 4*x = 4x

L-last 4*4 = 16

Now, you've got your quadratic equation. x^2 + 8x (because 4x+4x=8x) + 16