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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(100*(7/x)) = 0
x-700*x^-1 = 0
1*x^1-700*x^-1 = 0
(1*x^2-700*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-700*x^0) = 0
x^1
x^2-700 = 0
x^2-700 = 0
DELTA = 0^2-(-700*1*4)
DELTA = 2800
DELTA > 0
x = (2800^(1/2)+0)/(1*2) or x = (0-2800^(1/2))/(1*2)
x = 10*7^(1/2) or x = -10*7^(1/2)
x in { -10*7^(1/2), 10*7^(1/2)}
x in { -10*7^(1/2), 10*7^(1/2) }
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