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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/x-3+4 = x-(18/x)-4 // - x-(18/x)-4
18/x-x+(3*x)/x-3+4+4 = 0
18*x^-1-1*x^1+8*x^0 = 0
(8*x^1-1*x^2+18*x^0)/(x^1) = 0 // * x^2
x^1*(8*x^1-1*x^2+18*x^0) = 0
x^1
8*x-x^2+18 = 0
8*x-x^2+18 = 0
DELTA = 8^2-(-1*4*18)
DELTA = 136
DELTA > 0
x = (136^(1/2)-8)/(-1*2) or x = (-136^(1/2)-8)/(-1*2)
x = (2*34^(1/2)-8)/(-2) or x = (-2*34^(1/2)-8)/(-2)
x in { (2*34^(1/2)-8)/(-2), (-2*34^(1/2)-8)/(-2)}
x in { (2*34^(1/2)-8)/(-2), (-2*34^(1/2)-8)/(-2) }
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