Question
Answer
$$a^2-6+3a+3+4a^2-4a+15=5a^2-a+12$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}a^2-6+3a+3+4a^2-4a+15& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}a^2+3a-3+4a^2-4a+15 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}5a^2-a+12\end{aligned} $$ | |
| ① | Combine like terms: $$ a^2 \color{blue}{-6} +3a+ \color{blue}{3} = a^2+3a \color{blue}{-3} $$ |
| ② | Combine like terms: $$ \color{blue}{a^2} + \color{red}{3a} \color{green}{-3} + \color{blue}{4a^2} \color{red}{-4a} + \color{green}{15} = \color{blue}{5a^2} \color{red}{-a} + \color{green}{12} $$ |
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