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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x = 96/x-4 // - 96/x-4
x-(96/x)+4 = 0
x-96*x^-1+4 = 0
1*x^1-96*x^-1+4*x^0 = 0
(1*x^2+4*x^1-96*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+4*x^1-96*x^0) = 0
x^1
x^2+4*x-96 = 0
x^2+4*x-96 = 0
DELTA = 4^2-(-96*1*4)
DELTA = 400
DELTA > 0
x = (400^(1/2)-4)/(1*2) or x = (-400^(1/2)-4)/(1*2)
x = 8 or x = -12
x in { -12, 8}
x in { -12, 8 }
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