Answer
$$(z+0.2)(z+0.4)=z^2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(z+0.2)(z+0.4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}z^2+0z+0z+0 \xlongequal{ } \\[1 em] & \xlongequal{ }z^2 \cancel{0z} \cancel{0z}0 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}z^2\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{z0}\right) $ by each term in $ \left( z0\right) $. $$ \left( \color{blue}{z0}\right) \cdot \left( z0\right) = z^2 \cancel{0z} \cancel{0z}0 $$ |
| ② | Combine like terms: $$ z^2 \, \color{blue}{ \cancel{0z}} \, \, \color{blue}{ \cancel{0z}} \,0 = z^2 $$ |
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