Respuesta :

Answer:

4x2 - 4x + 4.

Step-by-step explanation:

x2 - 3x - 4 -  (x - 3x2 - 8)        Distribute the negative over the parentheses:

= x2 - 3x - 4 - x + 3x2 + 8       Bring like terms together:

= x2 + 3x2 - 3x - x - 4 + 8

= 4x2 - 4x + 4.

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