Question 801727
Foci: (+-5,0), major axis of length 26. Write in ellipse standard form 
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Given ellipse has a horizontal major axis with center at the origin.
Its standard form of equation: {{{x^2/a^2+y^2/b^2=1}}}
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center:(0,0)
given length of major axis=26=2a
a=13
a^2=169
c=5(distance from center to foci)
c^2=a^2-b^2
b^2=a^2-c^2=169-25=144
equation of given ellipse:
{{{x^2/169+y^2/144=1}}}