Question 1086399
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<pre>
Ellipse with foci at the points (-3,0) and (3,0) and the major axis of 8 units long.


Hence, the major semi-axis is 4 units long.


Then the minor semi-axis is {{{sqrt(4^2 - 3^2)}}} = {{{sqrt(7)}}}.


The equation of the ellipse is


{{{x^2/16}}} + {{{y^2/7}}} = 1.
</pre>

See the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Quadratic-relations-and-conic-sections/Ellipse-definition--canonical-equation--characteristic-points-and-elements.lesson>Ellipse definition, canonical equation, characteristic points and elements</A> 

in this site.



Also, &nbsp;you have this free of charge online textbook in ALGEBRA-II in this site

&nbsp;&nbsp;&nbsp;&nbsp;<A HREF=https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson>ALGEBRA-II - YOUR ONLINE TEXTBOOK</A>.


The referred lesson is the part of this online textbook under the topic 
"<U>Conic sections: Ellipses. Definition, major elements and properties. Solved problems</U>".