Question

с^5-с^4-с+1 ...........

Answer 1

С^5 - с^4 - с + 1 = с^4( с - 1 ) - ( с - 1 ) = ( с - 1 )( с^4 - 1 ) = ( с - 1 )( с^2 - 1 )( с^2 + 1 ) = ( с - 1 )( с - 1 )( с + 1 )( с^2 + 1 )