Add $ \, \color{blue}{ x^3-9x } \, $ and $ \, \color{orangered}{ 3x^2+2x }$.
Answer
$$ \left( \color{blue}{x^3-9x} \right) + \left( \color{orangered}{3x^2+2x} \right) = x^3+3x^2-7x $$
Explanation
Step 1: Write second polynomial below the first one. Making sure like terms are lined up.
$$ \begin{array}{lrrr} & x^3 & & -9x \\ \color{blue}{ + } & & 3x^2 & 2x \\ \hline \end{array} $$Step 2: Combine like terms (add each column):
$$ \begin{array}{lrrr} & x^3 & & -9x \\ \color{blue}{ + } & & 3x^2 & 2x \\ \hline & x^3 & 3x^2 & -7x \end{array} $$This page was created using
Polynomial Operations Calculator