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D( x )
16-(9*x)^2 < 0
x^6 = 0
16-(9*x)^2 < 0
16-(9*x)^2 < 0
-81*x^2 < -16
-81*x^2 < -16 // * -1
81*x^2 > 16
81*x^2 > 16 // : 81
x^2 > 16/81
x^2 > 16/81 // ^ 1/2
abs(x) > 4/9
x in (-oo:-4/9) U (4/9:+oo)
x^6 = 0
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in <-4/9:0) U (0:4/9>
((16-(9*x)^2)^1.5)/(x^6) = 0
((16-81*x^2)^1.5)/(x^6) = 0
-81*x^2 = -16 // : -81
x^2 = 16/81
x^2 = 16/81 // ^ 1/2
abs(x) = 4/9
x = 4/9 or x = -4/9
x in { 4/9, -4/9 }
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