Point B has coordinates (2,1). The x-coordinate of point A is -7 . The distance between point A and point B is 15 units. What are the possible coordinates of point A?
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Possible coordinates for A can be
(-7,13) and (-7,-13)
By distance formula 225 = 81 + x
Where x is the square of difference between y coordinates of A and B
y can be 13 negative and positive resulting in difference of 12 and hence square 144 for x.
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