JEE MATHEMATICS MCQ: PAIR OF STRAIGHT LINES

1 Easy

1 of 1

Application +4 | -1

The equation

3 a x^2+9 x y+\left(a^2-2\right) y^2=0

represents two perpendicular straight lines for

View answer and explanation

Correct option: C

for only two values of

a

The correct answer is C (for only two values of

a

) because for the lines to be perpendicular, the sum of the coefficients of

x^2

and

y^2

must be zero, leading to a quadratic equation with two solutions for

a

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