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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-(14/x)-3 = 0
4*x-14*x^-1-3 = 0
4*x^1-14*x^-1-3*x^0 = 0
(4*x^2-3*x^1-14*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-3*x^1-14*x^0) = 0
x^1
4*x^2-3*x-14 = 0
4*x^2-3*x-14 = 0
DELTA = (-3)^2-(-14*4*4)
DELTA = 233
DELTA > 0
x = (233^(1/2)+3)/(2*4) or x = (3-233^(1/2))/(2*4)
x = (233^(1/2)+3)/8 or x = (3-233^(1/2))/8
x in { (3-233^(1/2))/8, (233^(1/2)+3)/8}
x in { (3-233^(1/2))/8, (233^(1/2)+3)/8 }
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