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Question

Q(h, k) is the foot of the perpendicular of P(3, 6) on the line x - 2y + 4 =0.

If the slope of PQ is m, find m2.


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Solution

PQ is r to the given line.

Slope of x - 2 y + 4 = 12

12×m=1

m = -2

m2=4


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