Разложите на множители: (2--x^2) (a^2-4)+(a-2)^2 30 !

( 2 - x ) - ( 4 - x² ) = ( 2 - x ) - ( 2 - x )( 2 + x ) = ( 2 - x )( 1 - ( 2 + x )) =
= ( 2 - x )( 1 - 2 - x ) = ( 2 - x )( - 1 - x ) 

( a² - 4 ) + ( a - 2 )² = ( a - 2 )( a + 2 ) + ( a - 2 )² = ( a - 2 )( ( a + 2 ) - ( a - 2 )) =
= ( a - 2 )( a + 2 - a + 2 ) = 4( a - 2 )