Adding 3+2y−5y2+6y3,−8+3y+7y3 and 5−6y−8y3+y2, we get
−3y−4y2+5y3
−y−3y2+5y3
−y−4y2+5y3
−y−4y2+6y3
The correct option is B. −y−4y2+5y3
3+2y−5y2+6y3 −8+3y+7y3 +5−6y+y2−8y3–––––––––––––––––––––– −y−4y2+5y3
Hence, the required sum is −y−4y2+5y3.
Add: 3+2y−5y2+6y3, −8+3y+7y3 and 5−6y−8y3+y2