Question

Select the correct product (x2+4) (x2-4) x4 16 x4+16 x2+8x+16 x2 8x 16

Answer 1

The answer would be x^4 -16
Explanation: use the FOIL method.
(x^2 +4)(x^2 -4)= x^4 +4x -4x -16. 4x and -4x cancel each other out. You are left with x^4 -16.
F- irst
O- uter
I- nner
L- ast