The simplified form of x^(-12) is as follows:
We have a negative exponent. It means that the expression is a fraction of the form:
x^(-a) = 1/x^a
Therefore
x^(-12) = 1/x^(12)
When there is a negative exponent, the expression results in this form. This is part of the exponent's rules.
So, the simplified form of x^(-12) is option 4.