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x8 - 256 = (x4 + 16)*(x4 - 16)
= (x4 + 16)*(x2 + 4)*(x2 - 4)
= (x4 + 16)*(x2 + 4)*(x + 2)*(x - 2)
The expression 9+5 is equivalent.
If an algebraic expression is equivalent to another algebraic expression then it is an equation.
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