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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x = 48/x // - 48/x
3*x-(48/x) = 0
3*x-48*x^-1 = 0
3*x^1-48*x^-1 = 0
(3*x^2-48*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2-48*x^0) = 0
x^1
3*x^2-48 = 0
3*x^2-48 = 0
DELTA = 0^2-(-48*3*4)
DELTA = 576
DELTA > 0
x = (576^(1/2)+0)/(2*3) or x = (0-576^(1/2))/(2*3)
x = 4 or x = -4
x in { -4, 4}
x in { -4, 4 }
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