Question

very very urgent please help

Answer 1

use indent a+b a-b = a^2+b^2

Answer 2

=(X + 1/x)(x - 1/x)(x^2 + 1/x^2)
=(x^2 - 1/x^2)(x^2 + 1/x^2)
=(x^4 - 1/x^4)