If you have as your exponent, e.g., , then you won't be using binomial expansion. Perhaps you're supposed to use logarithms.
Edit: Seems I misinterpreted your question. At any rate, maybe this link on Newton's generalized binomial theorem will help.
Sorry. It was my fault. I should have worded it better.
Got it! Thank you. Little bit got confused about as to what meant initially but got it. Thanks again.At any rate, maybe this link on Newton's generalized binomial theorem will help.