Question
Answer
$$(9x-1)(x-2)=9x^2-19x+2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(9x-1)(x-2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9x^2-18x-x+2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}9x^2-19x+2\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{9x-1}\right) $ by each term in $ \left( x-2\right) $. $$ \left( \color{blue}{9x-1}\right) \cdot \left( x-2\right) = 9x^2-18x-x+2 $$ |
| ② | Combine like terms: $$ 9x^2 \color{blue}{-18x} \color{blue}{-x} +2 = 9x^2 \color{blue}{-19x} +2 $$ |
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