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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x = 72/x-3 // - 72/x-3
4*x-(72/x)+3 = 0
4*x-72*x^-1+3 = 0
4*x^1-72*x^-1+3*x^0 = 0
(4*x^2+3*x^1-72*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2+3*x^1-72*x^0) = 0
x^1
4*x^2+3*x-72 = 0
4*x^2+3*x-72 = 0
DELTA = 3^2-(-72*4*4)
DELTA = 1161
DELTA > 0
x = (1161^(1/2)-3)/(2*4) or x = (-1161^(1/2)-3)/(2*4)
x = (3*129^(1/2)-3)/8 or x = (-3*129^(1/2)-3)/8
x in { (-3*129^(1/2)-3)/8, (3*129^(1/2)-3)/8}
x in { (-3*129^(1/2)-3)/8, (3*129^(1/2)-3)/8 }
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