Question
Add $ \, \color{blue}{ 3n } \, $ and $ \, \color{orangered}{ -9n }$.
Answer
$$ \color{blue}{3n} + \left( \color{orangered}{-9n} \right) = -6n $$
Explanation
Step 1: Write second polynomial below the first one. Making sure like terms are lined up.
$$ \begin{array}{lr} & 3n \\ \color{blue}{ + } & -9n \\ \hline \end{array} $$Step 2: Combine like terms (add each column):
$$ \begin{array}{lr} & 3n \\ \color{blue}{ + } & -9n \\ \hline & -6n \end{array} $$This page was created using
Polynomial Operations Calculator