Question

Can someone check? Please and thank you!
An ellipse has foci at (–1, 1) and (–1, –7). The major axis is 12 units long. Show work for all answers.
-Determine the center of the ellipse.
-Determine the vertices of the ellipse.
-Find the equation of the ellipse.
I got (-1, -3) as the center.
(6,0) and (-6, 0) for the vertices
and y^2/ 36 + X^2/ 20 = 1

Answer 1

Sorry not so good in this topic :'(

Answer 2

its okay! thanks anyways! :)

Answer 3

and i just did these types of problems in summer school... smh

Answer 4

haha am i doing them right?

Answer 5

so the major axis is y, 6 high and 6 low...thinking

Answer 6

i m unsure about the vertices!

Answer 7

hold on its coming back to me lol

Answer 8

hahaha!

Answer 9

this graph is shifted to the left -1 so shouldnt your answer be in the (y+1)^2 + (x+1)^2

Answer 10

form

Answer 11

i always get confused about that! but i think it said its in x^2/ a^2 form? which one makes sense?

Answer 12

if your center was at (0,0) then it would be x^2 + y^2 = 1, but this is shifted to it has to be the other form

Answer 13

oh ok! so how can i change it to the other form?

Answer 14

simply change the numerator to (x+1)^2

Answer 15

you might leave the y^2 alone i cant remember

Answer 16

id literally have to dig through some of my notes to get you the right answer tho lol

Answer 17

oh haha i wish i had some notes i could look at!

Answer 18

i might be able to send you something hold up

Answer 19

may I share Salman Khan's video tutorial on focuses of ellipse?

Answer 20

loloololololol thanks guys!

Answer 21

http://www.youtube.com/watch?v=QR2vxfwiHAU

Answer 22

center will be (-1,-3) vertices (-1,3) (-1,-9)

Answer 23

nick, thanks! but no thanks

Answer 24

what does this have to do with you? lol

Answer 25

it is not my homework to solve :)

Answer 26

thank you so muchhh! ive been trying to work it out forever!

Answer 27

i dont think thew equation is right! cause it says b = 20

Answer 28

?

Answer 29

cause (X+1)^2/ 20

Answer 30

im not sure yet of how to make the equation out of that. do u know?

Answer 31

well the equation is (y+3)^2/ 36 + (X+1)^2/ 20 = 1 im just not sure that 20 is ther right number

Answer 32

so this (y+3)^2/ 36 + (X+1)^2/ 20 = 1 is the confirmed answer?

Answer 33

yes but im not sure about the 20! well i think its the confirmed answer haha

Answer 34

well a = 6, c=4, then u use b^2=a^2-c^2

Answer 35

your left with b^2=20

Answer 36

its c^2 = a^2- b^2

Answer 37

u sure

Answer 38

no your right

Answer 39

yesah but then it doesnt work!

Answer 40

it does work

Answer 41

add the b^2 subtract the c^2

Answer 42

when its plugged in you have 16=36-b^2

Answer 43

16- 36

Answer 44

add the b^2

Answer 45

-20

Answer 46

even then you have -20=-b^2, you would have to divide both sides by negative 1 to make the b positive

Answer 47

you gotta believe! lol

Answer 48

yeah so it would still be 20! haah i will thanks! I OWE YOU! YOU HONESTLY SAVED MY LIFE!

Answer 49

good i can sleep peaceful now lol good luck

Answer 50

HAHA SORRY
!!