document.write( "Question 262600: (1/2)r(r+1)-36=0 \n" ); document.write( "
Algebra.Com's Answer #193479 by mananth(16946)\"\" \"About 
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(1/2)r(r+1)-36=0
\n" ); document.write( "r(r+1)/2=36
\n" ); document.write( "r^2+r=72
\n" ); document.write( "r^2+r-72=0
\n" ); document.write( "r^2 +9r-8r-72=0
\n" ); document.write( "r(r+9) -8(r+9)=0
\n" ); document.write( "(r+9)(r-8)=0\r
\n" ); document.write( "\n" ); document.write( "R= -9 or 8\r
\n" ); document.write( "\n" ); document.write( "mananth@hotmail.com\r
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