I have an odd question, that I think I have worked out properly, but the answer makes no sense.
What are (a) the x-intercepts,(b) the y-intercepts and(c) the foci of the ellipse .
I have already determined that the x and y intercepts are: and ,respectively, meaning that the major axis is vertical as the y-intercept is greater than the x-intercept.
My problem is that when I use the relation:
the result is -9, so c is the square root of -9--which doesn't exist and cant be graphed, meaning I did something wrong.....
What was it that I did wrong?