Question

1. (7n^3 + 5 - 6n^4)+(2 - 5n^2 + 2n^3)

Explanation:

Step1: Remove parentheses

$7n^{3}+5 - 6n^{4}+2 - 5n^{2}+2n^{3}$

Step2: Combine like - terms

Combine the $n^{3}$ terms: $(7n^{3}+2n^{3})=9n^{3}$, and combine the constant terms: $(5 + 2)=7$.
$-6n^{4}-5n^{2}+9n^{3}+7$

Step3: Rearrange the terms in descending order of the exponent

$-6n^{4}+9n^{3}-5n^{2}+7$

Answer:

$-6n^{4}+9n^{3}-5n^{2}+7$