Question 83224
Subtract 4x-2x^2+4x^3 from 4x^3+x-3x^2

= (4x^3+x-3x^2) - (4x-2x^2+4x^3 )

= 4x^3+x-3x^2 - 4x + 2x^2 - 4x^3

= - x^2 - 3x