I need help with factoring by grouping?

x^ – x^ + x –
= (x^ + x) – (x^ + )
= (x)(x^ + ) – ()(x^ + )
= (x – )(x^ + )
= (x – )(x^ + )

x^ + x^ – x –
= (x^ – x) + (x^ – )
= (x)(x^ – ) + ()(x^ – )
= (x + )(x^ – )