Subtract polynomials: $ \, \color{blue}{ -3x+15 } \, $ , $ \, \color{orangered}{ -3x+9 }$.
Answer
$$ \left( \color{blue}{-3x+15} \right) - \left( \color{orangered}{-3x+9} \right) = 6 $$
Explanation
Step 1: Write second polynomial below the first one. Making sure like terms are lined up.
$$ \begin{array}{lrr} & -3x & 15 \\ \color{red}{ - } & -3x & 9 \\ \hline \end{array} $$Step 2: Change ALL the signs in the second row.
$$ \begin{array}{lrr} & -3x & 15 \\ \color{red}{ - } & 3x & -9 \\ \hline \end{array} $$Step 3: Combine like terms (add each column):
$$ \begin{array}{lrr} & -3x & 15 \\ \color{red}{ - } & 3x & -9 \\ \hline & -6x & 24 \end{array} $$This page was created using
Polynomial Operations Calculator