Add: 5+y−3y2+2y3,−8+3y+7y3 and 3−8y−4y3+2y2
Like terms can be added and subtracted. 5+y−3y2+2y3 −8+3y +7y3 3−8y+2y2 −4y3––––––––––––––––––––––– −4y −y2+5y3
Adding 3+2y−5y2+6y3,−8+3y+7y3 and 5−6y−8y3+y2, we get
The sum of 4y (3y2 + 5y – 7) and 2 (y3 – 4y2 + 5) is 14y3 + 12y2 + 28y + 10.