Answer
$$8r(2r+h)=8hr+16r^2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}8r(2r+h)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}16r^2+8hr \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}8hr+16r^2\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{8r} $ by $ \left( 2r+h\right) $ $$ \color{blue}{8r} \cdot \left( 2r+h\right) = 16r^2+8hr $$ |
| ② | Combine like terms: $$ 8hr+16r^2 = 8hr+16r^2 $$ |
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