-167
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x2-169
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x2 - 169 = (x + 13)*(x-13)
Id x2 = 169, then x = ±√169 = {-13, +13}
You don't. This expression does not have any factors.
If you are looking to factor this expression, then it does not have a real solution.
x2-81 = (x-9)(x+9)
If by "what is the answer to" you mean, "how do you factor", then there is no answer, as this expression can not be factored. If you're asking to solve for x where the expression above is equal to zero, then x is equal to 16.