how to do negative decimal exponets

Question

2^-0.4545

Remember that a negative power is the same as the reciprocal...

2^-b = 1/2^b

So you can compute the positive power, then take the reciprocal of the result.

Yes but that works with decimal

of course, use your calculator. square root is a power 1/2 or .5 Decimal powers are commonplace.