x" - 2x - 1= x" - 2x + 1 - 2= ( x - 1 )" - (√2)"= ( x - 1 - √2 )( x - 1 + √2 )4( x - y + 1 ) + y( y - 2x )= 4x - 4y + 4 + y" - 2xy= ( 4x - 2xy ) + ( 4 - 4y + y" )= 2x( 2 - y ) + ( 2 - y )"= ( 2 - y...