Question

5(4у-5)=0

(у-2)(у+1)=0

Answer 1

1) 20y-25=0
20y=25
y=1,25

2) y2+y-2y-2=0
y2-y-2=0
D=(-1)^2-4×1×(-2)=1+8=9
x1=1+3/2×1=4/2=2
x2=1-3/2×1=-2/2=-1