document.write( "Question 1109313: a rectangular photograph has an area of 40 inches. If the width of the photograph is 3 inches less than its height, find the dimensions of the photograph \n" ); document.write( "

Algebra.Com's Answer #724299 by ikleyn(52778) $\"\"$ $\"About$

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\n" ); document.write( "1. Mental solution.\r
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document.write( "     8 x 5 inches.\r\n" );
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\n" ); document.write( "\n" ); document.write( "2. Algebra solution.\r
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document.write( "    The condition gives you this equation\r\n" );
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document.write( "        x*(x+3) = 40.\r\n" );
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document.write( "        x^2 + 3x - 40 = 0.\r\n" );
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document.write( "    Now apply the quadratic formula or solve equation by factoring.\r\n" );
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document.write( "    On quadratic formula see the lessons\r\n" );
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document.write( "        Introduction into Quadratic Equations\r\n" );
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document.write( "        PROOF of quadratic formula by completing the square\r\n" );
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document.write( "    in this site.\r\n" );
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