Question 61814
(7x^3-2x^2+4x-1)-(9x^3-4x^2+x-3)+(2x^3-2x^2-3x-2)
(7x^3-2x^2+4x-1)-9x^3+4x^2-x+3+(2x^3-2x^2-3x-2)
then line them up
 7x^3-2x^2+4x-1
-9x^3+4x^2- x+3
 2x^3-2x^2-3x-2
_______________
everything cancels out

the answer is 0