Question
Answer
$$9x^2-8xy+7y^2-xy=9x^2-9xy+7y^2$$
Explanation
| $$ \begin{aligned}9x^2-8xy+7y^2-xy& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9x^2-9xy+7y^2\end{aligned} $$ | |
| ① | Combine like terms: $$ 9x^2 \color{blue}{-8xy} +7y^2 \color{blue}{-xy} = 9x^2 \color{blue}{-9xy} +7y^2 $$ |
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