Question
Answer
$$(5+2z\cdot2)\cdot4=16z+20$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(5+2z\cdot2)\cdot4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}(5+4z)\cdot4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}20+16z \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}16z+20\end{aligned} $$ | |
| ① | $$ 2 z \cdot 2 = 4 z $$ |
| ② | $$ \left( \color{blue}{5+4z}\right) \cdot 4 = 20+16z $$ |
| ③ | Combine like terms: $$ 16z+20 = 16z+20 $$ |
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