(x+1)^2-(x-2)(x+4) (а+b)(а-b)(а^2+b^2)

Question

(x+1)^2-(x-2)(x+4) (а+b)(а-b)(а^2+b^2)

Answer 1

(x+1)^2-(x-2)(x+4) (а+b)(а-b)(а^2+b^2)
x^2+2x+1-(x-2)*(x+4)*(a^2-b^2)*(a^2+b^2)
x^2+2x+1-(x^2+4x-2x-8)*(a^4-b^4)
x^2+2x+1-(x^2+2x-8)*(a^4-b^4)
x^2+2x+1-(a^4x^2-b^4x^2+2a^4x-2b^4*x-8a^4+8b^4)
x^2+2x+1-a^4x^2+b^4x^2-2a^4x+2b^4x+8a^4-8b^4