5(3y+1)²-27=(4y+9)(4y-9)+2(5y+2)(2y-7)
5(9y²+6y+1)-27=16y²-81+2(10y²-35y+4y-14)
45y²+30y+5-27=16y²-81+20y²-70y+8y-28
45y²+30y-22=36y²-62y-109
45y²+30y-22-36y²+62y+109=0
9y²+92y+87=0
D=b²-4ac=92²-4*9*87=8464-3132=5332
x1=-92+√5332/18=-92+√4*1333/18=-92+2√1333/18=-46+√1333/9
x2=-92-√5332/18=-92-√4*1333/18=-92-2√1333/18=-46-√1333/9