Finding the Radius and Center of a Circle with x2+y2=16

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Homework Statement


how do you find the radius and center with x2+y2=16 of a circle graph


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The Attempt at a Solution


I am completely stump don't even know where to start on this.
 
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Do you know the standard form for the equation of a circle that has radius r?
 

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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