Someone please help me I’ll give out brainliest please dont answer if you don’t know

Answer:
7n^2+3n−13
Step-by-step explanation:
Let's simplify step-by-step.
4n^2+8n−12+3n^2−5n−1
=4n^2+8n+−12+3n^2+−5n+(−1)
Combine Like Terms:
=4n^2+8n+−12+3n^2+−5n+(−1)
=(4n^2+3n^2)+(8n+−5n)+(−12+−1)
=7n^2+3n−13