Question
Answer
$$x^2+17x+72-(x+8)=x^2+16x+64$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}x^2+17x+72-(x+8)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^2+17x+72-x-8 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}x^2+16x+64\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( x+8 \right) = -x-8 $$ |
| ② | Combine like terms: $$ x^2+ \color{blue}{17x} + \color{red}{72} \color{blue}{-x} \color{red}{-8} = x^2+ \color{blue}{16x} + \color{red}{64} $$ |
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