document.write( "Question 1204632: Write the equation for the ellipse in standard form and general form.\r
\n" ); document.write( "\n" ); document.write( "center (3,-2), passing through (-4,-2), (10,-2), (3,1), and (3,-5)
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Algebra.Com's Answer #841007 by greenestamps(13200)\"\" \"About 
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\n" ); document.write( "The center is given as (3,-2).

\n" ); document.write( "Two points on the ellipse are (-4,-2) and (10,-2); each of those is 7 units horizontally from the center.

\n" ); document.write( "Two other points are (3,1) and (3,-5); each of those is 3 units vertically from the center.

\n" ); document.write( "So the ellipse has a horizontal semi-major axis of length 7 and a vertical semi-minor axis of length 3.

\n" ); document.write( "Given that information, the equation in standard form is

\n" ); document.write( "\"%28x-3%29%5E2%2F7%5E2%2B%28y%2B2%29%5E2%2F3%5E2=1\"

\n" ); document.write( "\"%28x-3%29%5E2%2F49%2B%28y%2B2%29%5E2%2F9=1\"

\n" ); document.write( "Convert to general form by multiplying by (9*49=441), expanding the expressions in parentheses, and simplifying.

\n" ); document.write( "\"9%28x-3%29%5E2%2B49%28y%2B2%29%5E2=441\"
\n" ); document.write( "\"9%28x%5E2-6x%2B9%29%2B49%28y%5E2%2B4y%2B4%29=441\"
\n" ); document.write( "\"9x%5E2-54x%2B81%2B49y%5E2%2B196y%2B196=441\"
\n" ); document.write( "\"9x%5E2%2B49y%5E2-54x%2B196y=164\" or \"9x%5E2%2B49y%5E2-54x%2B196y-164=0\"

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