Question
Answer
$$-x^2+4x-x^2=-2x^2+4x$$
Explanation
| $$ \begin{aligned}-x^2+4x-x^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-2x^2+4x\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-x^2} +4x \color{blue}{-x^2} = \color{blue}{-2x^2} +4x $$ |
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