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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(14*p^3*q^2)/(x^2)-16 = 0
14*p^3*q^2*x^-2 = 16 // : 14*p^3*q^2
x^-2 = (8/7)*p^-3*q^-2
-2 < 0
1/(x^2) = (8/7)*p^-3*q^-2 // * x^2
1 = (8/7)*p^-3*q^-2*x^2 // : (8/7)*p^-3*q^-2
7/8*p^3*q^2 = x^2
x^2 = 7/8*p^3*q^2 // ^ 1/2
abs(x) = (7/8)^(1/2)*p^(3/2)*q
x = (7/8)^(1/2)*p^(3/2)*q or x = -((7/8)^(1/2)*p^(3/2)*q)
x in { (7/8)^(1/2)*p^(3/2)*q, -((7/8)^(1/2)*p^(3/2)*q) }
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