Question
Answer
$$3k^2\cdot(4-7k)=-21k^3+12k^2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}3k^2\cdot(4-7k)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12k^2-21k^3 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-21k^3+12k^2\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{3k^2} $ by $ \left( 4-7k\right) $ $$ \color{blue}{3k^2} \cdot \left( 4-7k\right) = 12k^2-21k^3 $$ |
| ② | Combine like terms: $$ -21k^3+12k^2 = -21k^3+12k^2 $$ |
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