Question
Answer
$$-x^2+1800x-(600x+100)=-x^2+1200x-100$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-x^2+1800x-(600x+100)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-x^2+1800x-600x-100 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-x^2+1200x-100\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 600x+100 \right) = -600x-100 $$ |
| ② | Combine like terms: $$ -x^2+ \color{blue}{1800x} \color{blue}{-600x} -100 = -x^2+ \color{blue}{1200x} -100 $$ |
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