Use a change of variables to evaluate the following integral. 17 Sx√x². 2 x√x - 64 dx 8 What is the best choice of u for the change of variables? u= x² - 64 Find du. du = (2x) dx Rewrite the given integral using this change of variables. 17 Sx√√x². 2 X√x - 64 dx = JO SO du 8 (Type exact answers.) Find the function represented by the following series and find the interval of convergence of the series. [infinity] Σ (x - 2)2k 49k k=0