Question 134240
(x^4-4x^2-5)(x^2-x+2)

with this problem you just use distribution.

x^4(x^2-x+2)-4x(x^2-x+2)-5(x^2-x+2)
x^6-x^5+2x^4-4x^3+4x^2-8x-5x^2+5x-10
x^6-x^5+2x^4-4x^3+4x^2-5x^2-8x+5x-10
x^6-x^5+2x^4-4x^3-x^2-3x-10