MHT CET · Maths · Ellipse
The sum of focal radii of the curve \(90 x^{2}+25 y^{2}=225\) is
- A 5
- B 10
- C 6
- D 3
Answer & Solution
Correct Answer
(B) 10
Step-by-step Solution
Detailed explanation
Given curve is \(9 x^{2}+25 y^{2}=225\)
\(\Rightarrow\) \(\frac{x^{2}}{25}+\frac{y^{2}}{9}=1
\)
Here, \(a=5, b=3\)
\(\therefore \quad\) Sum of focal radii \(=2 a=10\)
\(\Rightarrow\) \(\frac{x^{2}}{25}+\frac{y^{2}}{9}=1
\)
Here, \(a=5, b=3\)
\(\therefore \quad\) Sum of focal radii \(=2 a=10\)
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