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Coordinate Geometry

Question
CBSEENMA10009647

If the distance between the points (4, k) and (1, 0) is 5, then what can be the possible values of k?

Solution

Let the points X (4,k) and Y(1,0)
It is given that the distance XY is 5 units.
By using the distance formula,
XY space equals space square root of left parenthesis 4 minus 1 right parenthesis squared space plus left parenthesis straight k minus 0 right parenthesis squared end root
rightwards double arrow space 5 space equals space square root of 9 plus left parenthesis straight k right parenthesis squared end root
rightwards double arrow space 25 space equals space 9 space plus straight k squared
rightwards double arrow 16 space equals space straight k squared
rightwards double arrow plus-or-minus space 4 space equals space straight k