Subtract polynomials: $ \, \color{blue}{ 7x^2+x } \, $ , $ \, \color{orangered}{ 9x^2+4x }$.
Answer
$$ \left( \color{blue}{7x^2+x} \right) - \left( \color{orangered}{9x^2+4x} \right) = -2x^2-3x $$
Explanation
Step 1: Write second polynomial below the first one. Making sure like terms are lined up.
$$ \begin{array}{lrr} & 7x^2 & x \\ \color{red}{ - } & 9x^2 & 4x \\ \hline \end{array} $$Step 2: Change ALL the signs in the second row.
$$ \begin{array}{lrr} & 7x^2 & x \\ \color{red}{ - } & -9x^2 & -4x \\ \hline \end{array} $$Step 3: Combine like terms (add each column):
$$ \begin{array}{lrr} & 7x^2 & x \\ \color{red}{ - } & -9x^2 & -4x \\ \hline & 16x^2 & 5x \end{array} $$This page was created using
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