Answer
$11x^3+7x^2-12x-4$
degree: 3
Work Step by Step
$ (-6x^3 + 5x^2 - 8x + 9) + (17x^3 + 2x^2 - 4x - 13) =11x^3+7x^2-12x-4$
For monomials with the same power, you can add their coefficients to combine them.
The degree of a polynomial is the highest power.
