3r-4/r

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Solution for 3r-4/r equation: 


D( r )

r = 0

r = 0

r = 0

r in (-oo:0) U (0:+oo)

3*r-(4/r) = 0

3*r-4*r^-1 = 0

3*r^1-4*r^-1 = 0

(3*r^2-4*r^0)/(r^1) = 0 // * r^2

r^1*(3*r^2-4*r^0) = 0

r^1

3*r^2-4 = 0

3*r^2-4 = 0

DELTA = 0^2-(-4*3*4)

DELTA = 48

DELTA > 0

r = (48^(1/2)+0)/(2*3) or r = (0-48^(1/2))/(2*3)

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

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

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

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