Question
Answer
$$3x^2-9x-1+4x^2+6x+8=7x^2-3x+7$$
Explanation
| $$ \begin{aligned}3x^2-9x-1+4x^2+6x+8& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7x^2-3x+7\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3x^2} \color{red}{-9x} \color{green}{-1} + \color{blue}{4x^2} + \color{red}{6x} + \color{green}{8} = \color{blue}{7x^2} \color{red}{-3x} + \color{green}{7} $$ |
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