So I have this math problem:
Using the ellipse x^2/a^2 + y^2/b^2 = 1 and assuming that a>b, determine two formulae that calculate the distance from a point on the ellipse to each of the foci. Use the formulae to show that the sum of the distances is 2a.
I know that the foci are at (sqrt(a^2-b^2), 0) and (-sqrt(a^2-b^2), 0), but I can't get a formula for the distance of a point to them. I was able to get this extremely long and ugly value, but I'm unable to simplify it and show that it will add to 2a. Any suggestions? Thanks in advance.
Using the ellipse x^2/a^2 + y^2/b^2 = 1 and assuming that a>b, determine two formulae that calculate the distance from a point on the ellipse to each of the foci. Use the formulae to show that the sum of the distances is 2a.
I know that the foci are at (sqrt(a^2-b^2), 0) and (-sqrt(a^2-b^2), 0), but I can't get a formula for the distance of a point to them. I was able to get this extremely long and ugly value, but I'm unable to simplify it and show that it will add to 2a. Any suggestions? Thanks in advance.