document.write( "Question 814235: See the advertisement below. How wide will the free concrete decking be if a uniform width is constructed around the perimeter of the pool? Round to the nearest hundredth of a yard. (Hint: Note the difference in units.)
\n" ); document.write( "18X30 ft pool, buy now and receive 28 square yards of concrete decking free! \n" ); document.write( "

Algebra.Com's Answer #490182 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "6X10 yd pool( 60 yd^2), 28 square yards 
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document.write( " Area of Pool and Walkway = 88 yd^2
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document.write( "Let x be width of Walkway
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document.write( " (6+2x)(10+2x) = 88
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document.write( " 4x^2 + 32x + 60 =88
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document.write( " 4x^2 + 32x -28 = 0
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document.write( "  x^2 + 8x - 7 = 0  
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document.write( "Solved by pluggable solver: SOLVE quadratic equation with variable
Quadratic equation  (in our case ) has the following solutons:
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document.write( "  
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document.write( "  
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document.write( "  For these solutions to exist, the discriminant  should not be a negative number.
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document.write( "  
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document.write( "  First, we need to compute the discriminant : .
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document.write( "  
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document.write( "  Discriminant d=92 is greater than zero. That means that there are two solutions: .
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document.write( "  
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document.write( "    
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document.write( "    Quadratic expression  can be factored:
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document.write( "  
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document.write( "  Again, the answer is: 0.795831523312719, -8.79583152331272.\n" );
document.write( "Here's your graph:
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