document.write( "Question 122434: The length of a rectangle measures 4 cm less than 4 times the width. If the area is 31.0 cm^2, find the dimensions. \n" ); document.write( "
Algebra.Com's Answer #89897 by ddreamfox(6) ![]() You can put this solution on YOUR website! Let x = width \n" ); document.write( " 4x-4 = length (4 cm less than 4 times the width) \n" ); document.write( "since Area = length X width\r \n" ); document.write( "\n" ); document.write( "Substitute values... to eqtn of Area\r \n" ); document.write( "\n" ); document.write( "31 = x(4x-4) \n" ); document.write( "31 = 4x2 - 4x \n" ); document.write( "0 = 4x2 - 4x - 31 \n" ); document.write( "Using quadratic formula, \n" ); document.write( "You'll get 2 values 1 positive and 1 negative... \n" ); document.write( "The correct answer is the positive answer which is 3.328cm (rounded off) \n" ); document.write( " |