1) 9x²-4x-2=0
D=16+72=88
x1= (4+√88)/18= (4+2√22)/18= (2+√22)/9
x2= (4-√88)/18= (2-√22)/9
2) 2y²+9y-486=0
D=81+3888=3969
x1= (-9+63)/4= 54/4= 13,5
x2= (-9-63)/4= -18
1) 9x²-4x-2=0
D=16+72=88
x1= (4+√88)/18= (4+2√22)/18= (2+√22)/9
x2= (4-√88)/18= (2-√22)/9
2) 2y²+9y-486=0
D=81+3888=3969
x1= (-9+63)/4= 54/4= 13,5
x2= (-9-63)/4= -18
2у(у+18)-27(у+18)=0
(У+18)(2у-27)=0
У+18=0
2у-27=0
У=-18
У=13,5
ответ:х1=-18;х2=13,5