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Question

If the slope of one of the lines represented by ax2+2hxy+by2=0 is square of the other then ab(a+b)+8h3

A
4abh
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B
5abh
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C
6abh
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D
8abh
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Solution

The correct option is D 6abh
ax2+2hxy+by2
Let are slope is m and other is m2
(m+m2)=2hb m3=ab
m(m+1)=2hb m=3ab
3ab(3ab+1)=2hb
on solving we get a2b+ab2+8h3=6abh
C is correct.

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