Well x squared could can be broken down (factored) into x times x. So yes, it can be.
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It is (x-1)(x-8) when factored
64-x2 = (8-x)(8+x) when factored
Not in real numbers. It can be factored to (x - 5i)(x + 5i) where i is the square root of negative one.
It is: (x-7)(x+7) when factored
x2-x-56 = (x+7)(x-8) when factored