1/2x^2-1/10x-2/5=0

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Solution for 1/2x^2-1/10x-2/5=0 equation: 


x in (-oo:+oo)

(1/2)*x^2-((1/10)*x)-(2/5) = 0

(1/2)*x^2+(-1/10)*x-2/5 = 0

1/2*x^2-1/10*x-2/5 = 0

DELTA = (-1/10)^2-(-2/5*1/2*4)

DELTA = 81/100

DELTA > 0

x = ((81/100)^(1/2)+1/10)/(1/2*2) or x = (1/10-(81/100)^(1/2))/(1/2*2)

x = 1 or x = -4/5

x in { -4/5, 1 }

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