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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = x // - x
7/x-x = 0
7*x^-1-1*x^1 = 0
(7*x^0-1*x^2)/(x^1) = 0 // * x^2
x^1*(7*x^0-1*x^2) = 0
x^1
7-x^2 = 0
7-x^2 = 0
DELTA = 0^2-(-1*4*7)
DELTA = 28
DELTA > 0
x = (28^(1/2)+0)/(-1*2) or x = (0-28^(1/2))/(-1*2)
x = -7^(1/2) or x = 7^(1/2)
x in { -7^(1/2), 7^(1/2)}
x in { -7^(1/2), 7^(1/2) }
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