3x+9x-12/12-15x+3x^2

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Solution for 3x+9x-12/12-15x+3x^2 equation: 


x in (-oo:+oo)

3*x^2+3*x+9*x-(15*x)-(12/12) = 0

3*x^2+3*x+9*x-15*x-1 = 0

3*x^2-3*x-1 = 0

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

DELTA = 21

DELTA > 0

x = (21^(1/2)+3)/(2*3) or x = (3-21^(1/2))/(2*3)

x = (21^(1/2)+3)/6 or x = (3-21^(1/2))/6

x in { (3-21^(1/2))/6, (21^(1/2)+3)/6 }

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