Question

Find the following product:(x-2)(x+2)
A. x^2+4x-4
B.x^2-4
C.x^2+4
D.x^2-4x-4

Answer 1

Use FOIL to expand.
\[x ^{2}+2x-2x-2^{2}\]

Answer 2

b

Answer 3

(x-2)(x+2)

Foil:
\[x\ \times\ x\ =x ^{2}\]
\[x\ \times\ 2 = 2x\]
\[-2\ \times\ x = -2x\]
\[-2\ \times\ 2 = -4\]

Answer:
\[x ^{2}+2x-2x-4\]Final Answer\[x ^{2}-4\]

Since 2x-2x cancel each other out.

So the answer is b.