x/2-x^2/5+20=0

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Solution for x/2-x^2/5+20=0 equation: 


x in (-oo:+oo)

x/2-((x^2)/5)+20 = 0

1/2*x-1/5*x^2+20 = 0

DELTA = (1/2)^2-(-1/5*4*20)

DELTA = 65/4

DELTA > 0

x = ((65/4)^(1/2)-1/2)/(-1/5*2) or x = (-(65/4)^(1/2)-1/2)/(-1/5*2)

x = -5/2*((65/4)^(1/2)-1/2) or x = 5/2*((65/4)^(1/2)+1/2)

x in { -5/2*((65/4)^(1/2)-1/2), 5/2*((65/4)^(1/2)+1/2) }

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