document.write( "Question 195933: Twice the square of a certain postive number is 144 more than twice the number. What is the number?\r
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Algebra.Com's Answer #146910 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
You're probably hung up on the translation:\r
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\n" ); document.write( "\n" ); document.write( "\"Twice the square of a certain postive number\" ----> \"2x%5E2\"
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\n" ); document.write( "\"144 more than twice the number\" ----> \"2x%2B144\"\r
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\n" ); document.write( "\n" ); document.write( "So the full translation is \"2x%5E2=2x%2B144\"\r
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\n" ); document.write( "\n" ); document.write( "\"2x%5E2=2x%2B144\" Start with the given equation.\r
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\n" ); document.write( "\n" ); document.write( "\"2x%5E2-2x-144=0\" Get all terms to the left side.\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=2\", \"b=-2\", and \"c=-144\"\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-%28-2%29+%2B-+sqrt%28+%28-2%29%5E2-4%282%29%28-144%29+%29%29%2F%282%282%29%29\" Plug in \"a=2\", \"b=-2\", and \"c=-144\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%282+%2B-+sqrt%28+%28-2%29%5E2-4%282%29%28-144%29+%29%29%2F%282%282%29%29\" Negate \"-2\" to get \"2\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%282+%2B-+sqrt%28+4-4%282%29%28-144%29+%29%29%2F%282%282%29%29\" Square \"-2\" to get \"4\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%282+%2B-+sqrt%28+4--1152+%29%29%2F%282%282%29%29\" Multiply \"4%282%29%28-144%29\" to get \"-1152\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%282+%2B-+sqrt%28+4%2B1152+%29%29%2F%282%282%29%29\" Rewrite \"sqrt%284--1152%29\" as \"sqrt%284%2B1152%29\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%282+%2B-+sqrt%28+1156+%29%29%2F%282%282%29%29\" Add \"4\" to \"1152\" to get \"1156\"\r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%282+%2B-+sqrt%28+1156+%29%29%2F%284%29\" Multiply \"2\" and \"2\" to get \"4\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%282+%2B-+34%29%2F%284%29\" Take the square root of \"1156\" to get \"34\". \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%282+%2B+34%29%2F%284%29\" or \"x+=+%282+-+34%29%2F%284%29\" Break up the expression. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+%2836%29%2F%284%29\" or \"x+=++%28-32%29%2F%284%29\" Combine like terms. \r
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\n" ); document.write( "\n" ); document.write( "\"x+=+9\" or \"x+=+-8\" Simplify. \r
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\n" ); document.write( "\n" ); document.write( "Remember, the problem stated that the number is positive. So the only answer is \"x+=+9\"
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