SOLUTION: Please help me solve the foci in this equation {{{49x^2/36+81y^2/64=1}}}.

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Question 374149: Please help me solve the foci in this equation 49x%5E2%2F36%2B81y%5E2%2F64=1.
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Here, a%5E2+=+64%2F81 while b%5E2+=+36%2F49. Now b%5E2+=+a%5E2+-+c%5E2. So that 36%2F49+=+64%2F81+-+c%5E2, or c%5E2+=+64%2F81+-+36%2F49.
c%5E2+=+220%2F81%2A49, or c+=+%282sqrt%2855%29%29%2F63.