document.write( "Question 918902: The length of a rectangle is 10cm more than its width if the area is 80cm^2 calculate it's perimeter \n" ); document.write( "

Algebra.Com's Answer #557306 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( "     .
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document.write( "A = (w+10)w = 80cm^2
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document.write( "w^2 + 10w - 80 = 0 
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document.write( "(Tossing out the negative solution for unit measure)
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document.write( "w = 5.247 (rounded) and L = 15.247 
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document.write( "P = 2(20.247) cm = 40.247
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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( "  For these solutions to exist, the discriminant  should not be a negative number.
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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=420 is greater than zero. That means that there are two solutions: .
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document.write( "    Quadratic expression  can be factored:
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document.write( "  Again, the answer is: 5.2469507659596, -15.2469507659596.\n" );
document.write( "Here's your graph:
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