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Question

A point moves so that the square of its distance from the point (3, –2) is numerically equal to its distance from the line 5x – 12y = 3. The equation of its locus is __________.

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Solution

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Let P(h, k) be the given point.
Such that square of the distance from the point (3, −2) is equal to the distance from the line 5x − 12y = 3
i.e. h-32+k+222 =5h-12k-352+122i.e. h-32+k+22 = 5h-12k-313i.e. h2+9-6h+k2+4+4k =5h-12k-313i.e. h2+k2-6h+4k+13=5h-12k-313i.e. 13h2+k2-78h+52k+169=5h-12k-3i.e. 13h2+k2-78h-5h+52k+12k+172=0i.e. 13h2+k2-83h+64k+172=0

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