Answer
$$-8(-8u+5)+5=64u-35$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-8(-8u+5)+5& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-(-64u+40)+5 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}64u-40+5 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}64u-35\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{8} $ by $ \left( -8u+5\right) $ $$ \color{blue}{8} \cdot \left( -8u+5\right) = -64u+40 $$ |
| ② | Remove the parentheses by changing the sign of each term within them. $$ - \left(-64u+40 \right) = 64u-40 $$ |
| ③ | Combine like terms: $$ 64u \color{blue}{-40} + \color{blue}{5} = 64u \color{blue}{-35} $$ |
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