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Any value - we'll say "x" - raised to a negative power is equal to one divided by that value to the absolute value of that same power. In other words:

x-y = 1 / (xy)

The easiest way to see why this is true is to think of how you would get to a negative power. Consider:

x4 / x = x3

x3 / x = x2

x2 / x = x1 (or simply "x")

As you can see, each time we divide by x, the the exponent is decreased by one. This holds true no matter how many times you do it:

x1 / x = x0 (which is the same as saying "x / x = 1")

x0 / x = x-1 (which can also be expressed as "1 / x = x-1")

x-1 / x = x-2 (or, (1/x) / x = 1/(x * x) = 1/x2)

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Q: How do you work with negative exponents?
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