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-2^{-2}+2^{-2}
To multiply powers of the same base, add their exponents. Add 1 and -3 to get -2.
-\frac{1}{4}+2^{-2}
Calculate 2 to the power of -2 and get \frac{1}{4}.
-\frac{1}{4}+\frac{1}{4}
Calculate 2 to the power of -2 and get \frac{1}{4}.
0
Add -\frac{1}{4} and \frac{1}{4} to get 0.