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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5-(3*x)-(4/x)-12-4 = 0
5-3*x-4*x^-1-12-4 = 0
-3*x^1-4*x^-1-11*x^0 = 0
(-3*x^2-11*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(-3*x^2-11*x^1-4*x^0) = 0
x^1
-3*x^2-11*x-4 = 0
-3*x^2-11*x-4 = 0
DELTA = (-11)^2-(-4*(-3)*4)
DELTA = 73
DELTA > 0
x = (73^(1/2)+11)/(-3*2) or x = (11-73^(1/2))/(-3*2)
x = (73^(1/2)+11)/(-6) or x = (11-73^(1/2))/(-6)
x in { (73^(1/2)+11)/(-6), (11-73^(1/2))/(-6)}
x in { (73^(1/2)+11)/(-6), (11-73^(1/2))/(-6) }
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