Question

Calcule:
(x+1){2} + (x - 1){2}+2(x+1) (x-1)

Answer 1

=2(x+1) + 2(x-1) + 2(x+1)(x-1)
=2[x+1+x-1+(x²-x+x-1)]
=2(2x+x²-1)
=4x²+2x²-2