Question

1. $(3 - 6n^{5}-8n^{4})-(-6n^{4}-3n - 8n^{5})$

Explanation:

Step1: Remove parentheses

\[

$$\begin{align*} &(3 - 6n^{5}-8n^{4})-(-6n^{4}-3n - 8n^{5})\\ =&3 - 6n^{5}-8n^{4}+6n^{4}+3n + 8n^{5} \end{align*}$$

\]

Step2: Combine like - terms

\[

$$\begin{align*} &(-6n^{5}+8n^{5})+(-8n^{4}+6n^{4})+3n + 3\\ =&2n^{5}-2n^{4}+3n + 3 \end{align*}$$

\]

Answer:

$2n^{5}-2n^{4}+3n + 3$