document.write( "Question 950552: Find the measure of the third side of the triangle given its 2 sides and perimeter. Side1 = 2x^2+5, Side2 = x^2+3x+4, P = 4x^2+12x+10. Please help \n" ); document.write( "
Algebra.Com's Answer #580459 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "Side1 \"a=+2x%5E2%2B5\",
\n" ); document.write( "Side2 \"b=+x%5E2%2B3x%2B4\",
\n" ); document.write( "\"P+=+4x%5E2%2B12x%2B10\"\r
\n" ); document.write( "\n" ); document.write( "find Side3 \"c\"\r
\n" ); document.write( "\n" ); document.write( "\"P+=a%2Bb%2Bc\".....solve for \"c\"\r
\n" ); document.write( "\n" ); document.write( "\"c=P+-%28a%2Bb%29\".......plug in given values\r
\n" ); document.write( "\n" ); document.write( "\"c=4x%5E2%2B12x%2B10+-%282x%5E2%2B5%2Bx%5E2%2B3x%2B4%29\"\r
\n" ); document.write( "\n" ); document.write( "\"c=4x%5E2%2B12x%2B10+-%283x%5E2%2B3x%2B9%29\"\r
\n" ); document.write( "\n" ); document.write( "\"c=4x%5E2%2B12x%2B10+-3x%5E2-3x-9\"\r
\n" ); document.write( "\n" ); document.write( "\"c=x%5E2%2B9x%2B1\"\r
\n" ); document.write( "\n" ); document.write( "so, Side3 is \"x%5E2%2B9x%2B1\"\r
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