Question
Answer
$$7+9x^4-(3x^5+8+2x^4)=-3x^5+7x^4-1$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}7+9x^4-(3x^5+8+2x^4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}7+9x^4-3x^5-8-2x^4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-3x^5+7x^4-1\end{aligned} $$ | |
| ① | Remove the parentheses by changing the sign of each term within them. $$ - \left( 3x^5+8+2x^4 \right) = -3x^5-8-2x^4 $$ |
| ② | Combine like terms: $$ \color{blue}{7} + \color{red}{9x^4} -3x^5 \color{blue}{-8} \color{red}{-2x^4} = -3x^5+ \color{red}{7x^4} \color{blue}{-1} $$ |
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