1) (x^3 - x^2 - 4x + 4)/ (x^3 - 4x)?

The answer is supposed to be x-1/x, how do I get there

I simplify it and all I get to is x^3 - (x-2)/ x(x+2).....anyone give me some help????

2) [1-h(k^-1)]/[ (h^-1) - (k^-1)]

1 minus h times k to the -1 divided/over h to the -1 minus k to the -1

The answer is supposed to be h..how do I get there? I'm clueless on this one. My fractions get all mixed up and stuff, I get confused on negative exponents...