2-21x-4/15x^2

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Solution for 2-21x-4/15x^2 equation: 


x in (-oo:+oo)

2-((4/15)*x^2)-(21*x) = 0

(-4/15)*x^2-21*x+2 = 0

2-4/15*x^2-21*x = 0

DELTA = (-21)^2-(-4/15*2*4)

DELTA = 6647/15

DELTA > 0

x = ((6647/15)^(1/2)+21)/(-4/15*2) or x = (21-(6647/15)^(1/2))/(-4/15*2)

x = -15/8*((6647/15)^(1/2)+21) or x = -15/8*(21-(6647/15)^(1/2))

x in { -15/8*((6647/15)^(1/2)+21), -15/8*(21-(6647/15)^(1/2)) }

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