Very Simple Question: Distance between planes

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Homework Statement



Hello, how to find the distance between two planes when given their cartesian equations?

help appreciated, thanks.
 
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hints:

you might as well consider planes that are parallel to each other so...

transform the problem into something simpler... instead of looking at distance between two planes, choose something on one plane and go from there.
 
actually, I've got it, thanks anyways!
 
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Thread 'Finding the nth roots of a complex number'

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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