Question

у в квадрате - 2у : 4 = 0,5у(6 - 2у)

Answer 1

y2-2y / 4 = 0.5y(6-2y)
4(y2-2y)=3y-y
4y2-8y-3y+y=0
4y2-10y=0
y(4y-10)=0
y1=0    4y=10
           y2=10/4=2.5