Question
Answer
$$4x(5x^2-4)+9x=20x^3-7x$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4x(5x^2-4)+9x& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}20x^3-16x+9x \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}20x^3-7x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{4x} $ by $ \left( 5x^2-4\right) $ $$ \color{blue}{4x} \cdot \left( 5x^2-4\right) = 20x^3-16x $$ |
| ② | Combine like terms: $$ 20x^3 \color{blue}{-16x} + \color{blue}{9x} = 20x^3 \color{blue}{-7x} $$ |
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