First slide

Pair of straight lines

Question

The equation to the image of the pair of lines $a x^{2} + 2 h x y + b y^{2} = 0$ where $h^{2} > a b$ with respect to $y = 0$ is

Moderate

A

$b x^{2} + 2 h x y + a y^{2} = 0$
B

$b x^{2} - 2 h x y + a y^{2} = 0$
C

$a x^{2} - 2 h x y + b y^{2} = 0$
D

$a x^{2} + 2 h x y + b y^{2} = 0$

Solution

$f (x, - y) = 0$

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