document.write( "Question 98282: Give the center of the circle with the equation x^2 + 2x + y^2 + 22 = 0
\n" ); document.write( "i came up with (-1, 5) from the book. the other answers are (2, 4) (1, 5) (-2, 4) am i right?
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Algebra.Com's Answer #71451 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
\"x%5E2+%2B+2x+%2B+y%5E2+%2B+22+=+0\" Start with the given equation\r
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\n" ); document.write( "\n" ); document.write( "\"x%5E2+%2B+2x+%2B+y%5E2=+-22\" Subtract 22 from both sides\r
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\n" ); document.write( "\n" ); document.write( "Take half of 2 to get 1. Now square 1 to get 1.\r
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\n" ); document.write( "\n" ); document.write( "\"x%5E2+%2B+2x+%2B1%2B+y%5E2=+-22%2B1\" Add the result 1 to both sides\r
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\n" ); document.write( "\n" ); document.write( "\"x%5E2+%2B+2x+%2B1%2B+y%5E2=+-21\" Combine like terms\r
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\n" ); document.write( "\n" ); document.write( "Here's where we run into problems. The right side number represents the radius of the circle. However, a negative number does not work for the radius (a length doesn't make sense). So check your problem again and make sure you entered your problem correctly.
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