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= 3y² +9y +5y +15
= (3y² +9y) +(5y +15)
= 3y(y +3) +5(y +3)
==> (3y +5) (y +3)
b. 2y² -7y +3
= 2y² -6y -y +3
= (2y² -6y) -(y -3)
= 2y(y -3) -1(y -3)
==> (2y -1) (y -3)