(a) Use the quadratic formula to solve the distance formula for http://homework.math.ucsb.edu/webwor...5b59f2bc11.png in terms of the other quantities. (The quadratic formula gives you two solutions, enter the larger one first.)

(b) Substitute http://homework.math.ucsb.edu/webwor...73ece9ebf1.png and http://homework.math.ucsb.edu/webwor...21878f2f31.png into the above formula and find http://homework.math.ucsb.edu/webwor...eba1435051.png

(c) Now check your answer to (a) is correct by plugging in the values for http://homework.math.ucsb.edu/webwor...973887cab1.png and http://homework.math.ucsb.edu/webwor...fd8fbc7ea1.png from (b) and seeing if your formula gives http://homework.math.ucsb.edu/webwor...afaf9e4c51.png