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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14*x = 22/x // - 22/x
14*x-(22/x) = 0
14*x-22*x^-1 = 0
14*x^1-22*x^-1 = 0
(14*x^2-22*x^0)/(x^1) = 0 // * x^2
x^1*(14*x^2-22*x^0) = 0
x^1
14*x^2-22 = 0
14*x^2-22 = 0
DELTA = 0^2-(-22*4*14)
DELTA = 1232
DELTA > 0
x = (1232^(1/2)+0)/(2*14) or x = (0-1232^(1/2))/(2*14)
x = (1*77^(1/2))/7 or x = (-77^(1/2))/7
x in { (-77^(1/2))/7, (1*77^(1/2))/7}
x in { (-77^(1/2))/7, (1*77^(1/2))/7 }
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