Question

21. What is the length of the major axis?




22. What is the length of the minor axis?



23. What is the sum of the focal radii?




24. What are the coordinates of the foci?

Answer 1

\[\frac{ (x-(-4))^{2} }{ 12 }\frac{ (y-1)^{2} }{ 8 } =1\]

Answer 2

http://openstudy.com/study#/updates/529faa90e4b01a67794e9a75

Answer 3

any confusing parts?

Answer 4

isnt the circle in the wrong place? i can't see how far it is from the center

Answer 5

my picture, yes, it was just a representation of a horizontal ellipse

Answer 6

i just can't see how far it is from the center. i know what you're talking about.. but i don't know the focal points so i have no clue how far it is..

Answer 7

the distance from the center to either focus is "c", \(\bf c=\sqrt{a^2-b^2}\) its sum would be c + c

Answer 8

oh ok..

Answer 9

\(\bf a=\sqrt{12}\qquad b=\sqrt{8}\\ \quad \\
a^2= 12\qquad b^2=8\)

Answer 10

thanks ..

Answer 11

:)

Answer 12

\(\bf a^2=\sqrt{12}\cdot \sqrt{12}\implies \sqrt{12^2}\implies 12\\ \quad \\
b^2=\sqrt{8}\cdot \sqrt{8}\implies \sqrt{8^2}\implies 8\)

Answer 13

the "a" and "b" components are the root version of the denominators

Answer 14

so 4 / 4

Answer 15

1

Answer 16

for... ... what part again?

Answer 17

c / c

Answer 18

\[c \div c\]

Answer 19

honestly i don't know

Answer 20

\(\bf c=\sqrt{a^2-b^2}\implies c=\sqrt{12-8}\implies c=\sqrt{4}\implies c=2\)

Answer 21

thats the major?

Answer 22

... no... that's the "c" component


the major axis is "a" units from the center of the ellipse, thus a + a is how long it's

the minor is "b" units from the center, thus b + b is how long it's

Answer 23

notice your "a" and "b" \(\bf \bf a=\sqrt{12}\qquad b=\sqrt{8}\\ \quad \\
a^2= 12\qquad b^2=8\)

Answer 24

omg.. im an idiot... what's c..

Answer 25

"c" is the distance form the vertex to the focii

Answer 26

\(\bf a+a\implies \sqrt{12}+\sqrt{12}\qquad \qquad b+b\implies \sqrt{8}+\sqrt{8}\)

Answer 27

vertex is the center.. right

Answer 28

thanks for explaining.. but im a lost pup -_-

Answer 29

yw