2-1/4 = 1/21/4 = 1/fourth root of 2
If your range is the real numbers, the fourth root of 2 is ±1.189 so that the answer is ±1/1.189 = ±0.841 approx.
However, if your range is the complex field, you will also have the values ±0.841*i where i is the imaginary square root of -1.
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2-4 = 16
(1/4)^(-2)=(4/1)^2=4^2=16
2 to the power of negative one is equal to 0.5
1.5 or 1 and 1/2
Answer #1:Negative one-half to the negative 4th power, ie -((1/2)-4) equals -16Answer #2:Negative one-half to the negative 4th power, ie (-1/2)-4 equals +16