Question

(x-2)^2-(x+2)^2

Answer 1

let a = x -2
b = x + 2

a^2 - b^2 = (a+b)(a-b) difference of squares

so (x-2)^2 - (x+2)^2 = (x-2 + x+2)(x-2-(x+2))

Answer 2

i got to that part but I'm still having trouble understanding it

Answer 3

Why?

Answer 4

thank you

Answer 5

Actually its (2x)(-4) = -8x