Question

a) (x+1)(x-1)2×


b) (ײ-1)(x+1)(x-1)



​

Answer 1

a)

$(x+1)(x-1)2x\\(x^2-1x+1x-1)2x\\(x^2-1)2x\\2x^3-2x$

b)

$(x^2-1)(x+1)(x-1)\\(x^2-1)(x^2-1x+1x-1)\\(x^2-1)(x^2-1)\\(x^4-1x^2-1x^2+1)\\x^4-2x^2+1$

Espero que tenha ajudado :)