document.write( "Question 188878: Graph 9x^2+y^2=9
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Algebra.Com's Answer #141667 by Mathtut(3670)\"\" \"About 
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\"x%5E2%2By%5E2%2F9=1\"
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\n" ); document.write( "\"c%5E2=9-1\"
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\n" ); document.write( "c=(+-)sqrt(8)
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\n" ); document.write( "c=(+-)2sqrt(2)
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\n" ); document.write( "foci are at (0,+2sqrt(2)) and (0,-2sqrt(2))
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