Answer
$$-7x(-7x+4)+4=49x^2-28x+4$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-7x(-7x+4)+4& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(-49x^2+28x)+4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}49x^2-28x+4\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{7x} $ by $ \left( -7x+4\right) $ $$ \color{blue}{7x} \cdot \left( -7x+4\right) = -49x^2+28x $$ |
| ② | Remove the parentheses by changing the sign of each term within them. $$ - \left(-49x^2+28x \right) = 49x^2-28x $$ |
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