document.write( "Question 668176: $\"+%282r-5%29%5E2=81+\"$ \n" ); document.write( "

Algebra.Com's Answer #415396 by ReadingBoosters(3246) $\"\"$ $\"About$

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\n" ); document.write( " $\"%282r-5%29%5E2+=+81\"$
\n" ); document.write( "...
\n" ); document.write( "(2r-5)(2r-5) = 81
\n" ); document.write( "...
\n" ); document.write( " $\"4r%5E2+-+10r+-+10r+%2B+25+=+81\"$
\n" ); document.write( "...
\n" ); document.write( " $\"4r%5E2+-+20r+-+56+=+0\"$
\n" ); document.write( "(4r+8)(r-7) = 0
\n" ); document.write( "4r+8 = 0, so r = $\"highlight_green%28-8%2F4+=+-2%29\"$
\n" ); document.write( "r-7 = 0, so r = $\"highlight_green%287%29\"$
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\n" ); document.write( "Solutions
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