Question
Answer
$$5x(x-3)+2x-7=5x^2-13x-7$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}5x(x-3)+2x-7& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}5x^2-15x+2x-7 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}5x^2-13x-7\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{5x} $ by $ \left( x-3\right) $ $$ \color{blue}{5x} \cdot \left( x-3\right) = 5x^2-15x $$ |
| ② | Combine like terms: $$ 5x^2 \color{blue}{-15x} + \color{blue}{2x} -7 = 5x^2 \color{blue}{-13x} -7 $$ |
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