To raise something by the power of negative one, take the reciprocal of the number. In this instance, -3/4-1 = -4/3 or negative four thirds. Expressed as a decimal, this is equal to -1.3 recurring (that is, -1.3333...)
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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.
1/8
0.25^-1 = 4
positive 1
It is -1/64.