Q 2408767608.     The pair of lines joining origin to the points of
intersection of the two curves
`ax^2 + 2hxy + by^2 + 2gx = 0`
and `a' x^2 + 2h' xy + b' y^2 + 2g' x = 0`
will be at right angles, if

UPSEE 2009
A

`(a'+ b' )g' = (a+ b)g`

B

`(a+b)g' = (a'+b')g`

C

`h^2 -ab = (h')^2 - a' b'`

D

`a + b + h^2 = a' + b' + (h')^2`

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