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Question

The point(s) on the yaxis which is (are) at a distance of 13 units from the point (5,7), is (are)

A
(0,19)
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B
(0,16)
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C
(0,5)
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D
(0,12)
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Solution

The correct options are
A (0,19)
C (0,5)
Let A=(5,7) and P=(0,y) be the required point on the y-axis. Then,
PA=13PA2=169(0+5)2+(y7)2=169(y7)2=144y7=±12y=5,19

Hence, the required points are (0,19) and (0,5)

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