document.write( "Question 478749: A rectangular flower garden with dimensions 3m by 7m is surrounded by
\n" ); document.write( "the walk of uniform width. If the area of the walk is 11 sq. m, what is the
\n" ); document.write( "width in meters? \n" ); document.write( "
Algebra.Com's Answer #328010 by mananth(16946)\"\" \"About 
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Let the width of sidewalk be x
\n" ); document.write( "Length of garden =7
\n" ); document.write( "Width = 3
\n" ); document.write( "Area = 21M^2
\n" ); document.write( "Area of sidewalk =11 M^2
\n" ); document.write( "Length of ground + sidewalk = 7+2x
\n" ); document.write( "width of ground + sidewalk = 3+2x
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\n" ); document.write( "(7+2x)(3 +2x)-11 =21
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\n" ); document.write( "21+14x+6 x+4x^2- 11=21\r
\n" ); document.write( "\n" ); document.write( "4x^2+20x -11=0
\n" ); document.write( " Find the roots of the equation by quadratic formula a= 4 b= 20 c= -11
\n" ); document.write( " b^2-4ac= 400 + 176
\n" ); document.write( " b^2-4ac= 576
\n" ); document.write( "\"sqrt%28%09576%09%29\"= 24
\n" ); document.write( " \"x=%28-b%2B-sqrt%28b%5E2-4ac%29%29%2F%282a%29\"
\n" ); document.write( " \"x1=%28-b%2Bsqrt%28b%5E2-4ac%29%29%2F%282a%29\"
\n" ); document.write( " x1=( -20 + 24 )/ 8
\n" ); document.write( " x1= 0.5
\n" ); document.write( " x2=( -20 -24 ) / 8
\n" ); document.write( " x2= -5.5
\n" ); document.write( " Ignore negative value
\n" ); document.write( "The width = 0.5 m\r
\n" ); document.write( "\n" ); document.write( "m.ananth@hotmail.ca
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