Alternate Expression (Interpolation with Polynomials)

dmanniteaux
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Difficulty : College

Homework Statement



polyinter.jpg


The Attempt at a Solution



I am unsure how to approach this question. I think it involves a process where you add an expression & and subtract it (or multiply & divide) in order to manipulate the equation and rearrange it or reorder it. I've already tried expanding the (x-c)^i part, but later realized x^i - c^i does not equal (x-c)^i.

Any help would be much appreciated

Thanks!
 
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You might need to use an induction proof - so that you can just focus on the highest-order term.
 
Use the binomial theorem to expand (x-c)^i.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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