Question
Answer
$$3x^2-x-7-x^2+4x+5=2x^2+3x-2$$
Explanation
| $$ \begin{aligned}3x^2-x-7-x^2+4x+5& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x^2+3x-2\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3x^2} \color{red}{-x} \color{green}{-7} \color{blue}{-x^2} + \color{red}{4x} + \color{green}{5} = \color{blue}{2x^2} + \color{red}{3x} \color{green}{-2} $$ |
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