How do you rewrite #1/ (7x^-4y^-1)# using positive exponents?
We change the sign of an exponent when we move the term with that exponent to the other side of the fraction.
Some examples in math:
#a^(–b) = 1/a^b " "and" "x/y^(–z)=xy^z#
For this question, we can change the sign of the
#1/(7x^(–4)y^(–1))" "=" "(1x^4y^1)/7#
Then, since multiplying something by 1 doesn't change its value, and raising something to the power of 1 also doesn't change its value, we can remove the 1's from this fraction: