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D( x )
x^2-64 = 0
x^2-64 = 0
x^2-64 = 0
1*x^2 = 64 // : 1
x^2 = 64
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
x in (-oo:-8) U (-8:8) U (8:+oo)
(9*x)/(x^2-64) = 0
9*x = 0 // : 9
x = 0
x = 0
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