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D( x )
10*v^2*x^6 < 0
2*v^5*x^7 < 0
10*v^2*x^6 < 0
10*v^2*x^6 < 0
10*v^2*x^6 = 0
10*v^2*x^6 = 0 // : 10*v^2
x^6 = 0
x = 0
x < 0
(-oo:0)(0:+oo)x-+
2*v^5*x^7 < 0
2*v^5*x^7 < 0
2*v^5*x^7 = 0
2*v^5*x^7 = 0 // : 2*v^5
x^7 = 0
x = 0
x < 0
(-oo:0)(0:+oo)x-+
x in <0:+oo)
(10*v^2*x^6)^(1/2)*(2*v^5*x^7)^(1/2) = 0
10^(1/2)*2^(1/2)*v^(7/2)*x^(13/2) = 0 // : 10^(1/2)*2^(1/2)*v^(7/2)
x^(13/2) = 0
x = 0
x = 0
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