X 2 )( x 3 2 x 4 )= 20 July 8, 2019 16 32 64 128 5 /( x 2 3 /( x 2 20 /( x 2 4 3 2 x 3 2 x 20 4 divided by 81 X 1 )( x 2 )( x 3 )( x 4 )+ 2019 X 1 )( x 2 )( x 3 )( x 4 )+ 2011 1 x 2 2x 3 3x 4 2023 x 2024 X 1 2011 x 2 2010 x 3 2009 x 4 2008 2