Answer
$12x^3-5x^2-4x-4$
Work Step by Step
Consider the given polynomial
$(-7x^3+6x^2-11x+13)+(19x^3-11x^2+7x-17)$
Need to drop the parentheses.
Thus,
$(-7x^3+6x^2-11x+13)+(19x^3-11x^2+7x-17)=-7x^3+6x^2-11x+13)+19x^3-11x^2+7x-17$
$=-7x^3+19x^3+6x^2-112x^2-4x-4$
$=12x^3-5x^2-4x-4$