document.write( "Question 209727: area of a rectangle is 243 m2. The height is nine less than 4 times the base. What is the perimeter? \n" ); document.write( "
Algebra.Com's Answer #162261 by MathTherapy(10552)![]() ![]() You can put this solution on YOUR website! area of a rectangle is 243 m2. The height is nine less than 4 times the base. What is the perimeter?\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Let base of rectangle be B\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Since the height is nine less than 4 times the base, then the height is 4B - 9\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Since its area = 243m^2, we will have: B(4B - 9) = 243\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "B(4B - 9) - 243 = 0\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "(4B + 27)(B - 9) = 0\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Therefore, 4B = - 27, or, B = 9\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "We will ignore the negative value as measuremnets CANNOT be negative\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "This means that B, or base = 9 meters\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Now, since base = 9 meters, then height = 4(9) - 9, or, 27\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Since base = 9 meters, and height = 27 meters, then perimeter = 2B + 2H ------> 2(9) + 2(27) ------> 18 + 54 = ( |