Question

1. $3n^2 - 5n + 5n^2 + 4n + 4$

Explanation:

Step1: Combine $n^2$ terms

$3n^2 + 5n^2 = 8n^2$

Step2: Combine $n$ terms

$-5n + 4n = -n$

Step3: Keep constant term

$+4$

Step4: Combine all simplified terms

$8n^2 - n + 4$

Answer:

$8n^2 - n + 4$