document.write( "Question 1009763: Poster is to be designed with 50 in^2 of printed type, 4 inch margins on both the top and the bottom, and 2 inch margins on each side. Find the dimensions of the poster which minimize the amount of paper used \n" ); document.write( "
Algebra.Com's Answer #625289 by josgarithmetic(39617)\"\" \"About 
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Draw the picture. x and y dimensions of the poster. x for horizontal, y for vertical.\r
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\n" ); document.write( "\n" ); document.write( "\"A=xy\" for area function;
\n" ); document.write( "\"%28x-2%2A2%29%28y-2%2A4%29=50\"\r
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\n" ); document.write( "\n" ); document.write( "Use the print-type region equation, .... \"y=50%2F%28x-4%29%2B8\" and substituting into A, omitting to show the steps here,
\n" ); document.write( "\"highlight_green%28A%28x%29=%2850x%29%2F%28x-4%29%2B8x%29\".\r
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\n" ); document.write( "\n" ); document.write( "Taking derivative of that in preparation to find optimized values,
\n" ); document.write( "\"dA%2Fdx=%28%28x-4%2950-50x%2A1%29%2F%28x-4%29%5E2%2B8\"
\n" ); document.write( "and again omitting further algebra steps for the derivative,...
\n" ); document.write( "\"highlight_green%28dA%2Fdx=%288x%5E2-64x-72%29%2F%28x-4%29%5E2%29\"\r
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\n" ); document.write( "\n" ); document.write( "Set that equal to 0, solve for x, and find corresponding y value.\r
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\n" ); document.write( "\n" ); document.write( "Focus on the numerator to be set to 0.
\n" ); document.write( "\"8x%5E2-64x-72=0\"
\n" ); document.write( "\"x%5E2-8x-9=0\"
\n" ); document.write( "\"%28x-9%29%28x%2B1%29=0\"\r
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\n" ); document.write( "\n" ); document.write( "The meaningful value for x is \"highlight%28x=9%29\".\r
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\n" ); document.write( "\n" ); document.write( "Use that to find y
\n" ); document.write( "\"y=50%2F%289-4%29%2B8\"
\n" ); document.write( "\"highlight%28y=18%29\"
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