Question
Answer
$$4n-3n^3-(4n^3-7n)=-7n^3+11n$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}4n-3n^3-(4n^3-7n)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4n-3n^3-4n^3+7n \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-7n^3+11n\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 4n^3-7n \right) = -4n^3+7n $$ |
| ② | Combine like terms: $$ \color{blue}{4n} \color{red}{-3n^3} \color{red}{-4n^3} + \color{blue}{7n} = \color{red}{-7n^3} + \color{blue}{11n} $$ |
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