Question

a. $(4n^{2}+5)-(-2n^{2}+2n-4)$

Explanation:

Step1: Distribute the negative sign

$4n^2 + 5 + 2n^2 - 2n + 4$

Step2: Combine like $n^2$ terms

$4n^2 + 2n^2 = 6n^2$

Step3: Combine constant terms

$5 + 4 = 9$

Step4: Assemble simplified expression

$6n^2 - 2n + 9$

Answer:

$6n^2 - 2n + 9$