document.write( "Question 198912: A picture frame dimesions are 20cm by 30cm. If a mat was put inside the frame that decreases the picture area by 264cm^2, how wide is the mat? \n" ); document.write( "
Algebra.Com's Answer #149420 by checkley75(3666)![]() ![]() ![]() You can put this solution on YOUR website! (20-2X)(30-2X)=264 \n" ); document.write( "600-60X-40X+4X^2=264 \n" ); document.write( "4X^2-100X+600-264=0 \n" ); document.write( "4X^2-100X+336=0 \n" ); document.write( "4(X^2-25X+84)=0 \n" ); document.write( "4(X-21)(X-4)=0 \n" ); document.write( "X-21=0 \n" ); document.write( "X=21 ANS. \n" ); document.write( "X-4=0 \n" ); document.write( "X=4 ANS. \n" ); document.write( " \n" ); document.write( " |