Q5 of 184 Page 10

Find the point on x - axis which is equidistant from the following pair of points:

(2, - 5) and (- 2, 9)

Given points are A(2, - 5) and B(- 2, 9).



We need to find a point on x - axis which is equidistant from these points.


Let us assume the point on x - axis be S(x, o).


We know that distance between the points (x1, y1) and (x2, y2) is .


From the problem,


SA = SB


SA2 = SB2


(x - 2)2 + (0 - (- 5))2 = (x - (- 2))2 + (0 - 9)2


(x - 2)2 + (5)2 = (x + 2)2 + (- 9)2


x2 - 4x + 4 + 25 = x2 + 4x + 4 + 81


8x = - 56



x = - 7


The point on x - axis is (- 7, 0).


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