Question

Factor: x2 - 16


(x - 4)(x - 4)


(x - 4)(x + 4)


(x - 8)(x + 2)


(x - 2)(x + 8)

Answer 1

it's a difference of two squares..what is the square root of x^2 and 16 (individually)?

Answer 2

8

Answer 3

and 4

Answer 4

\[(x - 4)(x - 4)=x^2-4x-4x+16\]\[(x - 4)(x + 4)=x^2-4x+4x-16\]\[(x - 8)(x + 2)=x^2+2x-8x-16\]\[(x - 2)(x + 8)=x^2+8x-2x-16\]

Answer 5

^that's a fine way too....

Answer 6

I have no idea what that meant... but ok

Answer 7

it meant trial and error =))

Answer 8

Don't know what that means.

Answer 9

you solve each of the choices and see

Answer 10

i have just done the expansion of each expression

Answer 11

(x - 4)(x + 4)