Question

у^2-y-2=0
дискриминант

Answer 1

1. D=1-4*1*(-2)=9
2. x=2+3/2=5/2
x=2-3/2= -1/2

Answer 2

y^2-y-2=0
D=b^2-4ac
D=(-1)^2-4*1*(-2)=1+8=9=3^2
y1=1-3/2*1=-2/2=-1
y2=1+3/2*1=4/2=2
Ответ: -1;2