3r-27/81-r^2

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Solution for 3r-27/81-r^2 equation: 


r in (-oo:+oo)

3*r-r^2-(27/81) = 0

3*r-r^2-1/3 = 0

3*r-r^2-1/3 = 0

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

DELTA = 23/3

DELTA > 0

r = ((23/3)^(1/2)-3)/(-1*2) or r = (-(23/3)^(1/2)-3)/(-1*2)

r = ((23/3)^(1/2)-3)/(-2) or r = ((23/3)^(1/2)+3)/2

r in { ((23/3)^(1/2)-3)/(-2), ((23/3)^(1/2)+3)/2 }

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