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Question

If algebraic sum of distances of a variable line from points (2,0),(0,2) and (-2,-2) is zero, then the line passes through the fixed point


A

(-1,1)

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B

(1,1)

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C

(2,2)

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D

(0,0)

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Solution

The correct option is B

(1,1)


Explanation for the correct option:

Find the required point:

Let the variable line be ax+by+c=0

Given, the sum of the perpendicular from the points (2,0),(0,2) and (1,1) to ax+by+c=0 is zero

2×a+b×0+ca2+b2+a×0+b×2+ca2+b2+a×1+b×1+ca2+b2=0

±2a+ca2+b2±2b+ca2+b2±a+b+ca2+b2=0

2a+c+2b+c+a+b+c=0

3a+3b+3c=0

a+b+c=0

This is a linear relation between a,b and c.

By Comparing ax+by+c=0 and a+b+c=0, We get

The coordinates of fixed point are (1,1).

Hence, Option ‘B’ is Correct.


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