1/3X^2+1/21X-1=0

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Solution for 1/3X^2+1/21X-1=0 equation: 


X in (-oo:+oo)

(1/3)*X^2+(1/21)*X-1 = 0

1/3*X^2+1/21*X-1 = 0

DELTA = (1/21)^2-(-1*1/3*4)

DELTA = 589/441

DELTA > 0

X = ((589/441)^(1/2)-1/21)/(1/3*2) or X = (-(589/441)^(1/2)-1/21)/(1/3*2)

X = 3/2*((589/441)^(1/2)-1/21) or X = -3/2*((589/441)^(1/2)+1/21)

X in { -3/2*((589/441)^(1/2)+1/21), 3/2*((589/441)^(1/2)-1/21) }

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