I assume you mean...
8Z^2 - 64 = 0
8Z^2 = 64
Z^2 = 8
Z = sqrt(8) ( which can be factored and expressed.... )
Z = 2sqrt(2)
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if it is to the 2nd power it is 64 if it is to the 3rd power it is 512 .
-8z + 12 = 12 - 4z-8z +4z + 12 = 12 - 4z +4z-4z + 12 -12 = 12 -12-4z / -4 = 0 / -4z = 0:)
64 to the power of 1/6 is two.
64.
64 = 26