document.write( "Question 76154: Hello, I've struggled with conic sections for two months and keep getting the wrong answers. I skipped #s 3 and 4 on circles because those were right.
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\n" ); document.write( "Problem #5: \"Find the foci for the ellipse and sketch a graph of
$\"+x%5E2%2F9%2By%5E2%2F25=1\"$ .\"\r
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\n" ); document.write( "Unfortunately, all I got was a foci at +4,0 and -4,0; but I don't know how to graph it. \n" ); document.write( "

Algebra.Com's Answer #54675 by checkley75(3666) $\"\"$ $\"About$

You can put this solution on YOUR website!
x^2/9+y^2/25=1
\n" ); document.write( "setting y=0 we get
\n" ); document.write( "x^2/9=1
\n" ); document.write( "x^2=9
\n" ); document.write( "x=+-3
\n" ); document.write( "set x=0 we get
\n" ); document.write( "y^2/25=1
\n" ); document.write( "y^2=25
\n" ); document.write( "y=+-5
\n" ); document.write( "y^2/25=-x^2/9+1
\n" ); document.write( "y^2=25(-x^2/9)+25
\n" ); document.write( "y=sqrt(25*-x^2/9+25)
\n" ); document.write( " $\"+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+y+=+sqrt%2825%28-x%5E2%29%2F9+%2B25%29%29+\"$ (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = sqrt(25(-x^2)/9 +25)). \n" ); document.write( "

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