The expression you've written seems to be missing an exponent value for the power of negative two (-²). It looks like there might have been a typo since the negative square usually applies to a term or a set of terms in parentheses.
If, for example, the expression was intended to be the square of the negative of the quantity (a-b), it would be written as: \[ (-(a-b))^2 \]
If the expression should be raising the term (6(a-b)) to the negative two power, it would be written as: \[ (6(a-b))^{-2} \]
This would mean "the reciprocal of the square of 6 times the quantity (a-b)". This expression can be simplified as follows:
\[ (6(a-b))^{-2} = \frac{1}{(6(a-b))^2} = \frac{1}{36(a-b)^2} \]
If neither of these interpretations is what you intended, please clarify your expression so I can assist you further.
