Question

Efetue e simplifique

d) (1+x) (1-x) - (1+x)²

Answer 1

d) (1+x) (1-x) - (1+x)²

1 - x^2 - ( 1 + 2x + x^2)

1 - x^2 - 1 - 2x - x^2

 - 2x^2 - 2x  

- 2x(x + 1 )