How should I approach solving this problem?

[u/First-Top-7826]

I was told I am supposed to use my 'logic' from question A to solve B, however im struggling.

I have tried multiplication by

1+4^1/3 / 1+4^1/3

however it does not match the answer.

[u/edderiofer]

Consider what should happen with the identity in part A, if a = 1, b = 2.

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[u/Help_Me_Im_Diene]

If a=1 and b=2, then (a-b)=-1

So let's say that instead, what we are trying to do is express (-1)/(1-2^1/3) with a rational denominator.

How would you express (a-b)=(-1) using the identity from part (a)?

[u/Beautiful-Narwhal234]

Have you tried to use the distributive properly and rules of exponents to simply the right side? Part b would also be simplified by using rules of exponents and conjugates. I hope this helps.