Question
Answer
$$3x\cdot(4-3x)=-9x^2+12x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3x\cdot(4-3x)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12x-9x^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-9x^2+12x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3x} $ by $ \left( 4-3x\right) $ $$ \color{blue}{3x} \cdot \left( 4-3x\right) = 12x-9x^2 $$ |
| ② | Combine like terms: $$ -9x^2+12x = -9x^2+12x $$ |
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