Answer:
6y^2 + 12y - 21
Step-by-step explanation:
combine like terms
=6y^2+12y−21
1y2+3y−6+4y−7+2y2+3y2−8+5y
=(y2+2y2+3y2)+(3y+4y+5y)+(−6+−7+−8) combine like terms
=6y^2+12y+−21
4.4m questions
5.6m answers