document.write( "Question 60435: From a square piece of cardboard with width x inches, a square of width x-3 inches is removed from the center. Write the area of the remaining piece as a function of x. \n" ); document.write( "
Algebra.Com's Answer #42994 by 303795(602)\"\" \"About 
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Area of the original piece of cardboard is \"x%5E2\".\r
\n" ); document.write( "\n" ); document.write( "Area of the hole is \"%28x-3%29%5E2+=x%5E2+-+6x+%2B+9\"\r
\n" ); document.write( "\n" ); document.write( "So the difference between these is
\n" ); document.write( "\"x%5E2+-+%28x%5E2+-6x+%2B+9%29+=+x%5E2+-+x%5E2+%2B+6x+-+9+=+6x+-+9+\"\r
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\n" ); document.write( "\n" ); document.write( "The area of the cardboard left after the hole is cut out is therefore 6x - 9
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