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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
45*x-56 = 45/x // - 45/x
45*x-(45/x)-56 = 0
45*x-45*x^-1-56 = 0
45*x^1-45*x^-1-56*x^0 = 0
(45*x^2-56*x^1-45*x^0)/(x^1) = 0 // * x^2
x^1*(45*x^2-56*x^1-45*x^0) = 0
x^1
45*x^2-56*x-45 = 0
45*x^2-56*x-45 = 0
DELTA = (-56)^2-(-45*4*45)
DELTA = 11236
DELTA > 0
x = (11236^(1/2)+56)/(2*45) or x = (56-11236^(1/2))/(2*45)
x = 9/5 or x = -5/9
x in { -5/9, 9/5}
x in { -5/9, 9/5 }
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