document.write( "Question 315009: A small rectangular playground that is 10feet by 14feet is going to have a grass border of uniform width on all sides. If the area of the grass is 145 sq.ft. how wide is the border. \n" ); document.write( "

Algebra.Com's Answer #225337 by checkley77(12844) $\"\"$ $\"About$

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10*13=1,400 is the area of the playground.
\n" ); document.write( "(10+2x)(14+2x)=1,400+145
\n" ); document.write( "1,400+28x+20x+4x^2=1,545
\n" ); document.write( "4x^2+48x+1,400-1,525=0
\n" ); document.write( "4x^2+48x-125=0
\n" ); document.write( " $\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"$
\n" ); document.write( "x=(-48+-sqrt[48^2-4*4*-125])/2*4
\n" ); document.write( "x=(-48+-sqrt[2,304+2,000])/8
\n" ); document.write( "x=(-48+-sqrt4,304)/8
\n" ); document.write( "x=(-48+-65.6)/8
\n" ); document.write( "x=(-48+65.6)/8
\n" ); document.write( "x=17.6/8
\n" ); document.write( "x=2.2 ans. for the width of the grass border.\r
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