document.write( "Question 147372: square root of 5-x =x-3
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Algebra.Com's Answer #107739 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
\"sqrt%285-x%29=x-3\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"5-x=%28x-3%29%5E2\" Square both sides.\r
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\n" ); document.write( "\n" ); document.write( "\"5-x=x%5E2-6x%2B9\" Foil the right side.\r
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\n" ); document.write( "\n" ); document.write( "\"5-x-x%5E2%2B6x-9=0\" Get all terms to the left side.\r
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\n" ); document.write( "\n" ); document.write( "\"-x%5E2%2B5x-4=0\" Combine like terms.\r
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\n" ); document.write( "\n" ); document.write( "Notice we have a quadratic equation in the form of \"ax%5E2%2Bbx%2Bc\" where \"a=-1\", \"b=5\", and \"c=-4\"\r
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\n" ); document.write( "\n" ); document.write( "Let's use the quadratic formula to solve for x\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4ac+%29%29%2F%282a%29\" Start with the quadratic formula\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-%285%29+%2B-+sqrt%28+%285%29%5E2-4%28-1%29%28-4%29+%29%29%2F%282%28-1%29%29\" Plug in \"a=-1\", \"b=5\", and \"c=-4\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-5+%2B-+sqrt%28+25-4%28-1%29%28-4%29+%29%29%2F%282%28-1%29%29\" Square \"5\" to get \"25\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-5+%2B-+sqrt%28+25-16+%29%29%2F%282%28-1%29%29\" Multiply \"4%28-1%29%28-4%29\" to get \"16\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-5+%2B-+sqrt%28+9+%29%29%2F%282%28-1%29%29\" Subtract \"16\" from \"25\" to get \"9\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-5+%2B-+sqrt%28+9+%29%29%2F%28-2%29\" Multiply \"2\" and \"-1\" to get \"-2\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-5+%2B-+3%29%2F%28-2%29\" Take the square root of \"9\" to get \"3\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-5+%2B+3%29%2F%28-2%29\" or \"x+=+%28-5+-+3%29%2F%28-2%29\" Break up the expression. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%28-2%29%2F%28-2%29\" or \"x+=++%28-8%29%2F%28-2%29\" Combine like terms. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+1\" or \"x+=+4\" Simplify. \r
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\n" ); document.write( "\n" ); document.write( "So the possible answers are \"x+=+1\" or \"x+=+4\"\r
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\n" ); document.write( "\n" ); document.write( "However, we need to check the possible answers.\r
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\n" ); document.write( "\n" ); document.write( "Check:\r
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\n" ); document.write( "\n" ); document.write( "Let's check the first answer \"x+=+1\"\r
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\n" ); document.write( "\n" ); document.write( "\"sqrt%285-x%29=x-3\" Start with the original equation.\r
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\n" ); document.write( "\n" ); document.write( "\"sqrt%285-1%29=1-3\" Plug in \"x+=+1\"\r
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\n" ); document.write( "\n" ); document.write( "\"sqrt%284%29=-2\" Subtract.\r
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\n" ); document.write( "\n" ); document.write( "\"2=-2\" Take the square root of 4 to get 2. \r
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\n" ); document.write( "\n" ); document.write( "Since this equation is not true, this means that \"x+=+1\" is not a real solution. \r
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\n" ); document.write( "\n" ); document.write( "Let's check the second answer \"x+=+4\"\r
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\n" ); document.write( "\n" ); document.write( "\"sqrt%285-x%29=x-3\" Start with the original equation.\r
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\n" ); document.write( "\n" ); document.write( "\"sqrt%285-4%29=4-3\" Plug in \"x+=+4\"\r
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\n" ); document.write( "\n" ); document.write( "\"sqrt%281%29=1\" Subtract.\r
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\n" ); document.write( "\n" ); document.write( "\"1=1\" Take the square root of 1 to get 1. \r
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\n" ); document.write( "\n" ); document.write( "Since this equation is true, this means that \"x+=+4\" is a real solution. \r
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\n" ); document.write( "\n" ); document.write( "Answer:\r
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\n" ); document.write( "\n" ); document.write( "So the only solution is \"x+=+4\"
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