Question
Answer
$$(k+1)(s+2)=ks+2k+s+2$$
Explanation
| $$ \begin{aligned}(k+1)(s+2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}ks+2k+s+2\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{k+1}\right) $ by each term in $ \left( s+2\right) $. $$ \left( \color{blue}{k+1}\right) \cdot \left( s+2\right) = ks+2k+s+2 $$ |
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