Question

3) Find the sum of 6x3 – 5x2 + 7x and -x3 + 7x2-8

Answer 1

$\begin{gathered} (6x^3-5x^2+7x)+(-x^3+7x^2-8)=6x^3-5x^2+7x-x^3+7x^2-8 \\ =5x^3+2x^2+7x-8 \end{gathered}$