document.write( "Question 1018183: We are stumped, I am trying to help my daughter and I have no clue help please....\r
\n" ); document.write( "\n" ); document.write( "The length of a rectangle is 1 inch more than twice its width. The value of the area of the rectangle (in square inches) is 5 more than the value of the perimeter of the rectangle (in inches). find the width.
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Algebra.Com's Answer #634351 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
They are doing something a little bit illegal here
\n" ); document.write( "and you should be aware of it. They are saying
\n" ); document.write( "an area ( in square inches ) is equal to a perimeter
\n" ); document.write( "( in inches ).
\n" ); document.write( "You can only do this if you say the VALUES are equal,
\n" ); document.write( "but you can't make an equation and say
\n" ); document.write( "[ inches ] = [ square inches ]
\n" ); document.write( "--------------------------------
\n" ); document.write( "Let the length of the rectangle = \"+L+\"
\n" ); document.write( "Let the width of the rectangle = \"+W+\"
\n" ); document.write( "(1) \"+L+=+2W+%2B+1+\"
\n" ); document.write( "------------------
\n" ); document.write( "Let the area of the rectangle = \"+A+\"
\n" ); document.write( "Let the perimeter of the rectangle = \"+P+\"
\n" ); document.write( "\"+A+=+L%2AW+\"
\n" ); document.write( "and
\n" ); document.write( "\"+P+=+2L+%2B+2W+\"
\n" ); document.write( "----------------
\n" ); document.write( "They are saying:
\n" ); document.write( "\"+A+=+P+%2B+5+\" ( even though the units don't match )
\n" ); document.write( "(2) \"+L%2AW+=+2L+%2B+2W+%2B+5+\"
\n" ); document.write( "Substitute (1) into (2)
\n" ); document.write( "(2) \"+%28+2W+%2B+1+%29%2AW+=+2%2A%28+2W+%2B+1+%29+%2B+2W+%2B+5+\"
\n" ); document.write( "(2) \"+2W%5E2+%2B+W+=+4W+%2B+2+%2B+2W+%2B+5+\"
\n" ); document.write( "(2) \"+2W%5E2+%2B+W+=+6W+%2B7+\"
\n" ); document.write( "(2) \"+2W%5E2+-+5W+-+7+=+0+\"
\n" ); document.write( "Use the quadratic formula to solve
\n" ); document.write( "\"+W+=+%28+-b+%2B-+sqrt%28+b%5E2+-+4%2Aa%2Ac+%29%29+%2F+%282%2Aa%29+\"
\n" ); document.write( "\"+a+=+2+\"
\n" ); document.write( "\"+b+=+-5+\"
\n" ); document.write( "\"+c+=+-7+\"
\n" ); document.write( "\"+W+=+%28+-%28-5%29+%2B-+sqrt%28+%28-5%29%5E2+-+4%2A2%2A%28-7%29+%29%29+%2F+%282%2A2%29+\"
\n" ); document.write( "\"+W+=+%28+5+%2B-+sqrt%28+25+%2B+56+%29%29+%2F4+\"
\n" ); document.write( "\"+W+=+%28+5+%2B-+sqrt%28+81+%29%29+%2F4+\"
\n" ); document.write( "\"+W+=+5%2F4+%2B+9%2F4+\"
\n" ); document.write( "\"+W+=+14%2F4+\"
\n" ); document.write( "\"+W+=+7%2F2+\" ( note that I can't use the negative square root )
\n" ); document.write( "The width is 3.5 in
\n" ); document.write( "-----------------
\n" ); document.write( "check:
\n" ); document.write( "(1) \"+L+=+2W+%2B+1+\"
\n" ); document.write( "(1) \"+L+=+2%2A%287%2F2%29+%2B+1+\"
\n" ); document.write( "(1) \"+L+-+8+\"
\n" ); document.write( "and
\n" ); document.write( "(2) \"+L%2AW+=+2L+%2B+2W+%2B+5+\"
\n" ); document.write( "(2) \"+L%2A%287%2F2%29+=+2L+%2B+2%2A%287%2F2%29+%2B+5+\"
\n" ); document.write( "(2) \"+%287%2F2%29%2AL+=+2L+%2B+12+\"
\n" ); document.write( "(2) \"+%287%2F2%29%2AL+-+%284%2F2%29%2AL+=+12+\"
\n" ); document.write( "(2) \"+%283%2F2%29%2AL+=+12+\"
\n" ); document.write( "(2) \"+L+=+%282%2F3%29%2A12+\"
\n" ); document.write( "(2) \"+L+=+8+\"
\n" ); document.write( "OK
\n" ); document.write( "
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