What are the foci of the ellipse given by the equation 100x2 + 64y2 = 64,000?
a. (0, ±6)
b. (±6, 0)
c. (0, ±36)
d. (±36, 0)

Question

What are the foci of the ellipse given by the equation 100x2 + 64y2 = 64,000?
a. (0, ±6)
b. (±6, 0)
c. (0, ±36)
d. (±36, 0)

tkhunny · Answer

Divide by 64,000 to put it in Standard Form and it should be more obvious.

anonymous · Answer

I got (0,+-6)

tkhunny · Answer

Awesome.  Too bad I have no idea how you managed that.  What was your process?

anonymous · Answer

Honestly I dont know used a ellipse calculator

tkhunny · Answer

Really?  Will that be availble on your exam?

Would you like to learn it?

anonymous · Answer

Yes Id like to know how to get the answer without the calculator

tkhunny · Answer

Okay, put it in Standarad Form.  Divide by 64,000.  What do you get?