a ) - (5x -5)³ - ( 2x -2)²- (x - 1)=
=- 5³(x -1)³ - 2²(x -1)²- (x - 1)=
=-(x -1)[(125(x-1)²-2²(x-1)-1]=
=(1-x)[(125(x²-2x+1)-4x+4-1]=
=(1-x)(125x²-250x+125-4x+3)=
=(1-x)(125x²-254x+128)
b) - 4 ( 2x - 9 )³ - ( 2x - 9 )² - ( 4x -18 ) =
= - 4 ( 2x - 9 )³ - ( 2x - 9 )² - 2( 2x -9 ) =
= - ( 2x - 9 )[2( 2x - 9 )² - ( 2x - 9 ) - 2] =
= (9- 2x)[4( 4x² -36x+81) - 2x + 9 - 2] =
= (9- 2x)(16x² -144x+324 - 2x + 7) =
= (9- 2x)(16x² -146x+331)