Question

(x+1)^2-(x-1)^2 dont kbow what to do

Answer 1

Use this formula a2 − b2 = (a + b)(a − b)

(x+1)^2-(x-1)^2  in this case, a = x+1, b = x-1

= [(x+1) + (x-1)] *  [(x+1) – (x-1)]

=(x +1 + x – 1) *(x +1 – x +1)

= 2x * 2

=4x