Question

Resolver
a.) (x-1) (x+1) (x+2) (x-2)
b.- (2-x) (x+2) (x-3) (3+x)

Answer 1

a) (x^2-1)(x^2-4)= x^4 -4x^2-x^2+4= x^4-5x^2-1

b) -(x+2)(x+2)(x-3)(3+x)=
-(x^2+4x+4)(3x+x^2-9-3x)=
(-x^2-4x-4)(x^2-9)=
-x^4-4x^3-4x^2+9x^2+36x+36=
-x^4-4x^3+5x^2+36x+36