Question

calcule: (ab - b + 1) (ab + a - 1) para a = 4  e b= -2

Answer 1

(ab - b + 1) (ab + a - 1)     a = 4  e b= -2

[4.(-2) - (-2) + 1].[4 .(-2) + 4 - 1]

[- 8 + 2 + 1] . [- 8 + 4 - 1]

[- 8 + 3] . [ - 8 - 1 + 4]

[- 5] . [- 9 + 4]

-5 . [- 5]

+ 25