(-3/4) exponent to the 2nd power = -1/27...How is that? it doesn't explain this problem in my book? Help please

(-3/4) exponent to the 2nd power = -1/27...How is that? it doesn't explain this problem in my book?

(-3/4)^2 ≠ -1/27

Did you copy the problem correctly?

The square of any real number is a positive number.

(-3/4)^2 = (-3)^2/4^2 = 9/16, not -1/27.