conic-section

Question: Focus and directrix of the parabola ${{x}^{2}}=-8ay$ are



1) $(0,\ -2a)\ \text{and}\ y=2a$
2) $(0,\ 2a)\ \text{and}\ y=-2a$
3) $(2a,\ 0)\ \text{and}\ x=-2a$
4) $(-2a,\ 0)\ \text{and}\ x=2a$
Solution: Explanation: No Explanation
Parabola

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