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(3y+5) (3y+5) (3y+5) (3y+5)
(9y² + 15y + 15y + 25) (9y² + 15y + 15y + 25)
(9y² + 30y + 25) (9y² + 30y + 25)
81y⁴ +270y +225y² +270y³ +900y²+750y+225y²+750y+625
81y⁴+270y³+1350y²+1770y+625