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D( x )
16/(x^14) < 0
x^14 = 0
16/(x^14) < 0
16/(x^14) < 0
16*x^-14 < 0
16*x^-14 < 0 // : 16
x^-14 < 0/16
x^-14 < 0
1/(x^14) < 0
x <> 0
1/(x^14) < 0 // * x^28
(x^28)/(x^14) < 0
x^14 < 0
x belongs to the empty set
x^14 = 0
x^14 = 0
1*x^14 = 0 // : 1
x^14 = 0
x = 0
x in (-oo:0) U (0:+oo)
(16/(x^14))^(1/4) = 0
2*x^(-7/2) = 0 // : 2
x^(-7/2) = 0
x należy do O
x belongs to the empty set
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