Question
Answer
$$8b^5\cdot(9-7b^4)=-56b^9+72b^5$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}8b^5\cdot(9-7b^4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}72b^5-56b^9 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-56b^9+72b^5\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{8b^5} $ by $ \left( 9-7b^4\right) $ $$ \color{blue}{8b^5} \cdot \left( 9-7b^4\right) = 72b^5-56b^9 $$ |
| ② | Combine like terms: $$ -56b^9+72b^5 = -56b^9+72b^5 $$ |
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