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x in (-oo:+oo)
x^4*((x^2-64)/8) = 0
(x^4*(x^2-64))/8 = 0
( x^2-64 )
1*x^2 = 64 // : 1
x^2 = 64
x^2 = 64 // ^ 1/2
abs(x) = 8
x = 8 or x = -8
( x^4 )
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in { 8, -8, 0 }
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