Answer
$$(x-18)(x-22)=x^2-40x+396$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(x-18)(x-22)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^2-22x-18x+396 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}x^2-40x+396\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{x-18}\right) $ by each term in $ \left( x-22\right) $. $$ \left( \color{blue}{x-18}\right) \cdot \left( x-22\right) = x^2-22x-18x+396 $$ |
| ② | Combine like terms: $$ x^2 \color{blue}{-22x} \color{blue}{-18x} +396 = x^2 \color{blue}{-40x} +396 $$ |
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