Question

9x^2 + 25y^2 = 225

The foci are:

(-4, 0) and (4, 0)
(0, -4) and (0, 4)
(-5, 0) and (5, 0)

Answer 1

Im preatty sure its c but how do i figure it out

Answer 2

@Directrix @inkyvoyd @mathmale

Answer 3

@pink33

Answer 4

Okay so have you tried to firgure this out?

Answer 5

i have a calculator online that just does it for me but id like to know how to do it

Answer 6

Oh,okay somethimes those calculator are wrong so I explain how to do it

Answer 7

ok please and thankyou

Answer 8

>Im preatty sure its c

I think that "c" is not correct. We will see after @pink33 does the explanation.

Answer 9

Okay I don't think c is correct

Answer 10

How did you get c?

Answer 11

just finding the x and y interepts

Answer 12

nvm i guess found the awnser myself

Answer 13

This is not an explanation but may help. @dirtydan667

Answer 14

ahhh yes wolfram alpha

Answer 15

Explanation courtesy of Phone-A-Friend @Mackenzie2013

Answer 16

@dirtydan667 ^^^^^

Answer 17

thanks for finding that

Answer 18

You are welcome.