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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8-(1/x) = (1/4)*x // - (1/4)*x
8-((1/4)*x)-(1/x) = 0
(-1/4)*x-x^-1+8 = 0
8*x^0-1/4*x^1-1*x^-1 = 0
(8*x^1-1/4*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(8*x^1-1/4*x^2-1*x^0) = 0
x^1
(-1/4)*x^2+8*x-1 = 0
(-1/4)*x^2+8*x-1 = 0
DELTA = 8^2-(-1*4*(-1/4))
DELTA = 63
DELTA > 0
x = (63^(1/2)-8)/(2*(-1/4)) or x = (-63^(1/2)-8)/(2*(-1/4))
x = -2*(3*7^(1/2)-8) or x = -2*(-3*7^(1/2)-8)
x in { -2*(3*7^(1/2)-8), -2*(-3*7^(1/2)-8)}
x in { -2*(3*7^(1/2)-8), -2*(-3*7^(1/2)-8) }
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