90-30x^2/18-6x

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Solution for 90-30x^2/18-6x equation: 


x in (-oo:+oo)

90-((30*x^2)/18)-(6*x) = 0

(-5/3)*x^2-6*x+90 = 0

90-5/3*x^2-6*x = 0

DELTA = (-6)^2-(-5/3*4*90)

DELTA = 636

DELTA > 0

x = (636^(1/2)+6)/(-5/3*2) or x = (6-636^(1/2))/(-5/3*2)

x = -3/10*(2*159^(1/2)+6) or x = -3/10*(6-2*159^(1/2))

x in { -3/10*(2*159^(1/2)+6), -3/10*(6-2*159^(1/2)) }

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