Question
Answer
$$4b(5b-3)-2b=20b^2-14b$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4b(5b-3)-2b& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}20b^2-12b-2b \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}20b^2-14b\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{4b} $ by $ \left( 5b-3\right) $ $$ \color{blue}{4b} \cdot \left( 5b-3\right) = 20b^2-12b $$ |
| ② | Combine like terms: $$ 20b^2 \color{blue}{-12b} \color{blue}{-2b} = 20b^2 \color{blue}{-14b} $$ |
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