A negative power just means to invert it. Let's say we had x^(-2) - it is the same thing as 1/(x^2).
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5 to the power of 2
0.04
3 to the power of 1 is 3. 3 to the power of minus 2 is equal to 1 over 3 to the power of 2. 3 to the power of 2 is 9. 3 to the power of 1 times 3 to the power of minus 2 is the same as... 3 divided by 3 to the power of 2. So that gives us 3 divided by 9 which is the same as 1/3.
-2 times -2 = plus 4 since minus times minus is plus
10 to the power of minus 2