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(-3/4) times 2 = -1/27.........How is that? it doesn't describe this in my book? Help

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(-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.