Question

Calcule (ab − b +1)⋅(ab + a −1), para a = 4 e b = - 2 . *​

Answer 1

$(ab - b + 1) \times (ab + a - 1)$

Substituindo as incógnitas:

$(4 \times ( - 2) - ( - 2)+ 1) \times (4 \times ( - 2) + 4 - 1)$

Resolvendo as multiplicações:

$( - 8 + 3) \times ( - 8 + 3)$

Resolvendo os parênteses:

$( - </strong><strong>5</strong><strong>) \times ( - 5)$

$= </strong><strong>2</strong><strong>5</strong><strong>$