2x-4/5x^2

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Solution for 2x-4/5x^2 equation: 


x in (-oo:+oo)

2*x-((4/5)*x^2) = 0

(-4/5)*x^2+2*x = 0

2*x-4/5*x^2 = 0

DELTA = 2^2-(-4/5*0*4)

DELTA = 4

DELTA > 0

x = (4^(1/2)-2)/(-4/5*2) or x = (-4^(1/2)-2)/(-4/5*2)

x = 0 or x = 5/2

x in { 0, 5/2 }

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