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When the point P(x, y) moves so that its distance from A(-1,0) is always twice its dis- tance from B(1, 0) it traces out a circle cen- tered on the z-axis as shown in y 2 A av B b with intercepts at x = a and x = b. 1. Find the value of a. 015 (part 2 of 2) 10.0 points 2. Find the value of b.