Resposta :
Resposta:
a) (m – 1)2 - ( m + 1). ( m - 1)
[tex] {m}^{2} - 2m + 1 - ( {m}^{2} - m + m - 1) \\ {m}^{2} - 2m + 1 - ( {m}^{2} - 1) \\ {m}^{2} - 2m + 1 - {m}^{2} + 1 \\ - 2m + 2[/tex]
b) ( x + 4) . ( x – 4) - ( x – 4 )2
[tex] {x}^{2} - 4x + 4x - 16 - ( {x}^{2} - 8x + 16) \\ {x}^{2} - 16 - {x}^{2} + 8x - 16 \\ 8x - 32[/tex]