Sunday

December 21, 2014

December 21, 2014

Posted by **jacob** on Sunday, December 7, 2008 at 8:22am.

the coordinates of two points are A(-2,6) and B(9,3). find the coordinates of the point C on the X-axis so that AC=BC

- MATH -
**drwls**, Sunday, December 7, 2008 at 8:49amIf it is on the X axis, y = 0. All you have to do is solve for x.

The distance of a point on the x axis from A is

D1 = sqrt [(x+2)^2 + 6^2}

and the distance from B is

D2 = sqrt [(x-9)^2 + 3^2]

Set D1 = D2, (or D1^2 = D2^2) and solve for x.

x^2 + 4x + 4 + 36 = x^2 -18x + 81 + 9

22 x = 90 - 40 = 50

x = 50/22 = 2.273

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