When we have x to a negative exponent we can move the x to the denominator and make the exponent positive.
So x-7 is the same as 1/x7 .
In general if we have a-n then this is the same as 1/an .
If you start with the negative in the denominator, then you can move it up to the numerator by changing the sign.
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A negative power. When something is to the power of negative two, say X it would be 1/X. If something is to the power of negative 3, it would be.... etc
1 divided by x to the third power equals x to the negative third. The derivative of x to the negative third is minus three x to the negative fourth.
5.478 to negative 7 power
-3 to the 2nd power is -3 x -3 = +9 ( negative x negative = positive)