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