document.write( "Question 93839: A triangle has sides 3x +7, 4x -9, and 5x +6. Find the expression the represent its perimeter. \n" ); document.write( "
Algebra.Com's Answer #68351 by jim_thompson5910(35256)\"\" \"About 
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Start with the given formula for finding the perimeter of a triangle\r
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\n" ); document.write( "\n" ); document.write( "\"P=S%5B1%5D%2BS%5B2%5D%2BS%5B3%5D\" where P is the perimeter and the S terms are the side lengths \r
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\n" ); document.write( "\n" ); document.write( "\"P=%283x+%2B7%29%2B%28+4x+-9%29%2B+%285x+%2B6%29\" Plug in the given sides\r
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\n" ); document.write( "\n" ); document.write( "\"P=3x%2B7%2B4x-9%2B5x%2B6\" Remove the parenthesis\r
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\n" ); document.write( "\n" ); document.write( "\"P=%283x%2B4x%2B5x%29%2B%287-9%2B6%29\" Group like terms\r
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\n" ); document.write( "\n" ); document.write( "\"P=12x%2B4\" Combine like terms\r
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\n" ); document.write( "\n" ); document.write( "So the expression that represents the perimeter is \"P=12x%2B4\"\r
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