Answer
$$(x+7)(x-3)=x^2+4x-21$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(x+7)(x-3)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^2-3x+7x-21 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}x^2+4x-21\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{x+7}\right) $ by each term in $ \left( x-3\right) $. $$ \left( \color{blue}{x+7}\right) \cdot \left( x-3\right) = x^2-3x+7x-21 $$ |
| ② | Combine like terms: $$ x^2 \color{blue}{-3x} + \color{blue}{7x} -21 = x^2+ \color{blue}{4x} -21 $$ |
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