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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-x-(5/1)-7 = 0
5/x-x-7-5 = 0
5*x^-1-1*x^1-12*x^0 = 0
(5*x^0-1*x^2-12*x^1)/(x^1) = 0 // * x^2
x^1*(5*x^0-1*x^2-12*x^1) = 0
x^1
5-x^2-12*x = 0
5-x^2-12*x = 0
DELTA = (-12)^2-(-1*4*5)
DELTA = 164
DELTA > 0
x = (164^(1/2)+12)/(-1*2) or x = (12-164^(1/2))/(-1*2)
x = (2*41^(1/2)+12)/(-2) or x = (12-2*41^(1/2))/(-2)
x in { (2*41^(1/2)+12)/(-2), (12-2*41^(1/2))/(-2)}
x in { (2*41^(1/2)+12)/(-2), (12-2*41^(1/2))/(-2) }
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