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D( x )
x < 0
x < 0
x in <0:+oo)
(x^(1/2))^7 = 4 // - 4
(x^(1/2))^7-4 = 0
1*x^(7/2) = 4 // : 1
x^(7/2) = 4
x^(7/2) = 4 // ^ 2
x^7 = 16 // ^ 1/7
x = 16^(1/7)
x = 16^(1/7)
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