Finding the maximum average power

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jaymo3141

Joined Feb 16, 2014
8
So I solved number one by finding Voc = 8.19 + 1.75j and Isc = 2.11 +2.47j then using Voc/Isc = Zth found |Zth| = 2.57. I am not sure how to do the next one.
I have tried finding he current through the variable resistor and squaring it and multiplying it by R = 2.57 but no luck. How do I solve this one
 

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