Question
Answer
$$9^2+6x-2+x^2-9x-1=x^2-3x+78$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}9^2+6x-2+x^2-9x-1& \xlongequal{ }81+6x-2+x^2-9x-1 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}6x+79+x^2-9x-1 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}x^2-3x+78\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{81} +6x \color{blue}{-2} = 6x+ \color{blue}{79} $$ |
| ② | Combine like terms: $$ \color{blue}{6x} + \color{red}{79} +x^2 \color{blue}{-9x} \color{red}{-1} = x^2 \color{blue}{-3x} + \color{red}{78} $$ |
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