Question

What must be substracted from x^4+3x^3+4x^2-3x-6 to get 3x^3+4x^2-x+3

Answer 1

Ans.

$x ^{4} + 3x ^{3} + 4x ^{2} - 3x - 6 - x ^{4} + 4x + 9$
$3x ^{3} + 4x ^{2} - x + 3$
Hence, we subtracted to x^4 + 4x +9