Question
Subtract polynomials: $ \, \color{blue}{ -3n^2 } \, $ , $ \, \color{orangered}{ -7n^2 }$.
Answer
$$ \color{blue}{-3n^2} - \left( \color{orangered}{-7n^2} \right) = 4n^2 $$
Explanation
Step 1: Write second polynomial below the first one. Making sure like terms are lined up.
$$ \begin{array}{lr} & -3n^2 \\ \color{red}{ - } & -7n^2 \\ \hline \end{array} $$Step 2: Change ALL the signs in the second row.
$$ \begin{array}{lr} & -3n^2 \\ \color{red}{ - } & 7n^2 \\ \hline \end{array} $$Step 3: Combine like terms (add each column):
$$ \begin{array}{lr} & -3n^2 \\ \color{red}{ - } & 7n^2 \\ \hline & -10n^2 \end{array} $$This page was created using
Polynomial Operations Calculator