conic-section

Question: The equation of ellipse whose distance between the foci is equal to 8 and distance between the directrix is 18, is

1) $5{{x}^{2}}-9{{y}^{2}}=180$

2) $9{{x}^{2}}+5{{y}^{2}}=180$

3) ${{x}^{2}}+9{{y}^{2}}=180$

4) $5{{x}^{2}}+9{{y}^{2}}=180$

Solution:

Explanation: No Explanation

Ellipse

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