Question

If (x2 – 4) = (x + 2) = x -2, which polynomial should fill in the blank below?

(х + 2) х
= х2 – 4
х? – 4
ооо
x – 2
х+2
х? - 2

Answer 1

Explanation:

use the identity a²-b²=(a-b)(a+b)

x²-4=(x-2)(x+2)

so the answer is x-2