Subtract polynomials: $ \, \color{blue}{ 3u^2 } \, $ , $ \, \color{orangered}{ -15u }$.
Answer
$$ \color{blue}{3u^2} - \left( \color{orangered}{-15u} \right) = 3u^2+15u $$
Explanation
Step 1: Write second polynomial below the first one. Making sure like terms are lined up.
$$ \begin{array}{lrr} & 3u^2 & \\ \color{red}{ - } & & -15u \\ \hline \end{array} $$Step 2: Change ALL the signs in the second row.
$$ \begin{array}{lrr} & 3u^2 & \\ \color{red}{ - } & & 15u \\ \hline \end{array} $$Step 3: Combine like terms (add each column):
$$ \begin{array}{lrr} & 3u^2 & \\ \color{red}{ - } & & 15u \\ \hline & 3u^2 & -15u \end{array} $$This page was created using
Polynomial Operations Calculator