Question
Answer
$$(x-2)(x-3)(x-4)=x^3-9x^2+26x-24$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}(x-2)(x-3)(x-4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}(x^2-3x-2x+6)(x-4) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}(x^2-5x+6)(x-4) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}x^3-4x^2-5x^2+20x+6x-24 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle4}{\textcircled {4}} } }}}x^3-9x^2+26x-24\end{aligned} $$ | |
| ① | Multiply each term of $ \left( \color{blue}{x-2}\right) $ by each term in $ \left( x-3\right) $. $$ \left( \color{blue}{x-2}\right) \cdot \left( x-3\right) = x^2-3x-2x+6 $$ |
| ② | Combine like terms: $$ x^2 \color{blue}{-3x} \color{blue}{-2x} +6 = x^2 \color{blue}{-5x} +6 $$ |
| ③ | Multiply each term of $ \left( \color{blue}{x^2-5x+6}\right) $ by each term in $ \left( x-4\right) $. $$ \left( \color{blue}{x^2-5x+6}\right) \cdot \left( x-4\right) = x^3-4x^2-5x^2+20x+6x-24 $$ |
| ④ | Combine like terms: $$ x^3 \color{blue}{-4x^2} \color{blue}{-5x^2} + \color{red}{20x} + \color{red}{6x} -24 = x^3 \color{blue}{-9x^2} + \color{red}{26x} -24 $$ |
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