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Question

The equation 12x2+7xy+ay2+13x−y+3=0 represents a pair of perpendicular lines. Then the value of ′a′ is

A
72
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B
19
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C
12
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D
12
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Solution

The correct option is A 12
Comparing the given equation with standard equation, we get a=12 and b=a, for perpendicular lines
coefficient of x2+ coefficient of y2=0
12+a=0
a=12

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