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A negative exponent is exactly the same as a positive one with one major exception: a negative power means divide 1 by that number. Sounds complicated but if you see it it's much simpler.

2=2/1

25=25/1

2^2=(2^2)/1

25^2=(25^2)/1

2^-2=1/(2^2)

25^-2=1/(25^2)

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