Answer:
6y-2y^2-6
Step-by-step explanation:
3y^2 +4y-5-(5y^2 -2y+1)
3y^2 +4y-5-5y^2 +2y-1
3y^2-5y^2 + 4y+2y-5-1
-2y^2+6y-6
