A point lies outside, on, or inside the parabola $y^2=4ax$ according as the value of $y^2-4ax$ is
Anegative, zero, positive respectively
Bpositive, zero, negative respectively
Czero, positive, negative respectively
Dpositive, negative, zero respectively
Answer & Solution
Correct answer: B. positive, zero, negative respectively
For the parabola $y^2=4ax$, the expression $y^2-4ax$ acts as the test quantity. If it is positive, the point is outside; if zero, the point lies on the parabola; if negative, the point is inside.
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