-2 to the power of -2
$$\\(-2)^{-2}=\frac{1}{(-2)^2}=\frac{1}{-2*-2}=\frac{1}{4}\\\\ but\\\\ -2^{-2}=-1*2^{-2} = \frac{-1}{(2)^2}=\frac{-1}{2*2}=\frac{-1}{4}\\\\$$