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Mathematics 23 Online
OpenStudy (anonymous):

What is the length of the major and minor axis?

OpenStudy (anonymous):

OpenStudy (anonymous):

this you visualize

OpenStudy (anonymous):

i also need the equation of the ellipse if possible

OpenStudy (anonymous):

from -1 to -9 is 8 units for the length of the major axis

OpenStudy (anonymous):

center is at \((2,-5)\) so the equation will look like \[\frac{(y+5)^2}{a^2}+\frac{(x-2)^2}{b^2}=1\] the \(y\) comes first because of the orientation

OpenStudy (anonymous):

thank you so so much, really helpful, so the length of the major axis is 8 then?

OpenStudy (anonymous):

half of 8 is 4, vertices are four units up and down from the center, so you know \(a=4\) and therefore it will be \[\frac{(y+5)^2}{16}+\frac{(x-2)^2}{b^2}=1\]

OpenStudy (anonymous):

so that equation would be the length of the major axis? can i simplify that more? @satellite73

OpenStudy (anonymous):

you need \(b\)

OpenStudy (anonymous):

how could i find that

OpenStudy (anonymous):

the length of the minor axis is 6, again from your eyeballs. so \(b=3\) and \(b^2=9\) for your denominator

OpenStudy (anonymous):

take a look at the purple math link, it will really help gotta run

OpenStudy (anonymous):

thanks so so much again!

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