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Question

If the lines x+2y+3=0,x+2y−7=0 and 2x−y−4=0 are the sides of a square, then equation of the remaining sides of the square can be

A
2xy+6=0
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B
2xy+8=0
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C
2xy10=0
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D
2xy14=0
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Solution

The correct options are
A 2xy+6=0
D 2xy14=0
Given eq of lines of sides of square are
x+2y+3=0
x+2y7=0 and 2xy4=0
Here since the first two lines are parallel as they have same slope and distance between them is |3(x)| i.e, 10 hence the fourth Eqn of the line to form a square would be a line with slope 2 and at a distance 10 from the third line
ie, 2xy4±10=0
Or, 2xy+6=0,2xy14=0

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