Question

Factor completely x2 + 16.

Answer 1

2(x+8)

Explanation:

2x+16

2(x+8)

Answer 2

unfactorable with real numbers

in the complex realm

(x-4i) (x+4i)

Explanation:

x^2+16

We can only factor this with imaginary numbers

(x^2 - (-4i)^2)

This is the difference of squares

(x -4i) (x+4i)