Answer
$$-7m(3m-4)+2=-21m^2+28m+2$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-7m(3m-4)+2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(21m^2-28m)+2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-21m^2+28m+2\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{7m} $ by $ \left( 3m-4\right) $ $$ \color{blue}{7m} \cdot \left( 3m-4\right) = 21m^2-28m $$ |
| ② | Remove the parentheses by changing the sign of each term within them. $$ - \left(21m^2-28m \right) = -21m^2+28m $$ |
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