Asked by Austin

What are all the foci’s for this ellipse?
x^2/9+y^2/16=1

Answers

Answered by Reiny
a^2 = 9 and b^2 = 16 so the major axis is the y-axis and the foci will lie on the y-axis

c^2 + 9 = 16
c^2 = 7
c = ±√7

the foci are (0 , ± √7)
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