Area of a triangle w/calculus?

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consider a triangle with the given vertices. (0,0), (5,2), (-1,6) Use calculus to find the area of the triangle.
Not quite sure how to do this..
 
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draw the graph and think about which line you want the area under and from which limits (you definitely need to integrate)
 

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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