Question

What are the foci of the graph x^2-4y^2=16

Answer 1

\[
\frac{x^2}{4^2}-\frac{y^2}{2^2}=1
\]

Answer 2

yes

Answer 3

a=4
b=2
c^2= a^2 + b^2 = 20

Answer 4

\[
c= 2 \sqrt{5}

\]

Answer 5

Elias, my son. You are a very thorough educator. I have learnt that you have been educating for 40 years.

Answer 6

The foci are
(c,0) and (-c,0)

Answer 7

I cannot be as good as Sir Isaac Newton !!!!