Question

Graph the ellipse and locate the foci.
x^2/36 + y^2/11 = 1

A. foci at (0, 6) and (0, -6)
B. foci at ( 5, 0) and (-5, 0)
C. foci at (square root of 11, 0) and (-square root of 11, 0)
D. foci at (0, 5) and (0, -5)

Answer 1

so, do you know how to find the foci?

Answer 2

no i forget things easily

Answer 3

http://www.mathwarehouse.com/ellipse/images/formul-focus.gif

Answer 4

"c" there, is the DISTANCE FROM THE CENTER, that is the (h,k) point, you ADD "c" to that, and the foci are there :)