Answer
$$-21z^5+4z^3-6z^3-10z^2+8z=-21z^5-2z^3-10z^2+8z$$
Explanation
| $$ \begin{aligned}-21z^5+4z^3-6z^3-10z^2+8z& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-21z^5-2z^3-10z^2+8z\end{aligned} $$ | |
| ① | Combine like terms: $$ -21z^5+ \color{blue}{4z^3} \color{blue}{-6z^3} -10z^2+8z = -21z^5 \color{blue}{-2z^3} -10z^2+8z $$ |
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