Решите уравнения.
1) y²+18y+81=0
2) 4y²+4y+1=0
3) -2x²+5x+3=0
4) 3x²-8x+5=0

1) y^2+18y+81=0
(y+9)^2=0
y^2+18y+81=0
(y+9)^2=0
y+9=0y=-9
2) 4y^2+4y+1=0
(2y+1)^2=0
4y^2+4y+1=0
(2y+1)^2=0
2y+1=0
y=-1/2
3) -2x^2+5x+3=0
3x+3=0
3x=-3
x=-1
4) Хз