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)\"\" \"About 
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( "
\n" );