Question
Subtract polynomials: $ \, \color{blue}{ x-7 } \, $ , $ \, \color{orangered}{ 7x+5 }$.
Answer
$$ \left( \color{blue}{x-7} \right) - \left( \color{orangered}{7x+5} \right) = -6x-12 $$
Explanation
Step 1: Write second polynomial below the first one. Making sure like terms are lined up.
$$ \begin{array}{lrr} & x & -7 \\ \color{red}{ - } & 7x & 5 \\ \hline \end{array} $$Step 2: Change ALL the signs in the second row.
$$ \begin{array}{lrr} & x & -7 \\ \color{red}{ - } & -7x & -5 \\ \hline \end{array} $$Step 3: Combine like terms (add each column):
$$ \begin{array}{lrr} & x & -7 \\ \color{red}{ - } & -7x & -5 \\ \hline & 8x & -2 \end{array} $$This page was created using
Polynomial Operations Calculator