Answer
$$(a+b)(c+d)=ac+ad+bc+bd$$
Explanation
| $$ \begin{aligned}(a+b)(c+d)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}ac+ad+bc+bd\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{a+b}\right) $ by each term in $ \left( c+d\right) $. $$ \left( \color{blue}{a+b}\right) \cdot \left( c+d\right) = ac+ad+bc+bd $$ |
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