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D( x )
49*x^4 < 0
49*x^4 < 0
49*x^4 < 0
49*x^4 < 0
49*x^4 < 0 // : 49
x^4 < 0/49
x^4 < 0
x belongs to the empty set
x in (-oo:+oo)
(49*x^4)^(1/2) = 0
7*x^2 = 0 // : 7
x^2 = 0
x = 0
x = 0
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