document.write( "Question 268890: The width of a rectangular playground is 2x -5 feet, and the length is 3x +9 feet. Write a polynomial P(x) that represents the perimeter and then evaluate this perimeter polynomial if x is 4 feet\r
\n" ); document.write( "\n" ); document.write( "please explain this problem im not really sure what to do with it.
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Algebra.Com's Answer #197137 by JBarnum(2146)\"\" \"About 
You can put this solution on YOUR website!
The width of a rectangular playground is 2x -5 feet, and the length is 3x +9 feet. Write a polynomial P(x) that represents the perimeter and then evaluate this perimeter polynomial if x is 4 feet
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\n" ); document.write( "Ok so we know that the Perimeter of a rectangle is Width+Width+Length+Length
\n" ); document.write( "in equation form its \"P=2W%2B2L\" If W=2x-5 and L=3x+9 then we can find P(x)by using substitution
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\n" ); document.write( "\"P=2W%2B2L\"
\n" ); document.write( "\"P%28x%29=2%282x-5%29%2B2%283x-9%29\" multiply the 2 in to both sets of parenthasies
\n" ); document.write( "\"P%28x%29=4x-10%2B6x-18\" Add like terms
\n" ); document.write( "\"P%28x%29=10x-28\" this is your equation
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\n" ); document.write( "\"P%28x%29=10x-28\" If x=4 then solve for P(x)
\n" ); document.write( "\"P%28x%29=10%284%29-28\"
\n" ); document.write( "\"P%28x%29=40-28\"
\n" ); document.write( "\"P%28x%29=12\" Perimeter = 12ft
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\n" ); document.write( "CHECKING ANSWER
\n" ); document.write( "\"P%28x%29=2%282x-5%29%2B2%283x-9%29\"
\n" ); document.write( "\"12=2%282%284%29-5%29%2B2%283%284%29-9%29\"
\n" ); document.write( "\"12=2%288-5%29%2B2%2812-9%29\"
\n" ); document.write( "\"12=2%283%29%2B2%283%29\"
\n" ); document.write( "\"12=6%2B6\"
\n" ); document.write( "\"12=12\"
\n" ); document.write( "CORRECT\r
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