Question

Check all that apply.

x2 - 4 = 0
A. X = 4
B. X = -2
C. x = 1
D. X = -4
E. X = 2
F. x = -1

Answer 1

This is the difference of squares rule. This is essentially the same exact thing as (x-2)(x+2). Apply FOIL and check if you feel the need. We can see the zeros the function are at 2 and -2