Question
Answer
$$(2x+1)(x-7)=2x^2-13x-7$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(2x+1)(x-7)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x^2-14x+x-7 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}2x^2-13x-7\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{2x+1}\right) $ by each term in $ \left( x-7\right) $. $$ \left( \color{blue}{2x+1}\right) \cdot \left( x-7\right) = 2x^2-14x+x-7 $$ |
| ② | Combine like terms: $$ 2x^2 \color{blue}{-14x} + \color{blue}{x} -7 = 2x^2 \color{blue}{-13x} -7 $$ |
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