Question
Answer
$$x^2-(x^2+9x-3)=-9x+3$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}x^2-(x^2+9x-3)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^2-x^2-9x+3 \xlongequal{ } \\[1 em] & \xlongequal{ } \cancel{x^2} -\cancel{x^2}-9x+3 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-9x+3\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( x^2+9x-3 \right) = -x^2-9x+3 $$ |
| ② | Combine like terms: $$ \, \color{blue}{ \cancel{x^2}} \, \, \color{blue}{ -\cancel{x^2}} \,-9x+3 = -9x+3 $$ |
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