Question

(-5).(+7)+(+9).(-4)​

Answer 1

$( - 5) \times ( + 7) + ( + 9) \times ( - 4) = \\ ( - 35) + ( + 9) \times ( - 4) = \\ ( - 35) + ( - 36) = \\ - 35 - 36 = - 71$

Answer 2

Olá....

( - 5) . ( + 7) + (+ 9) . ( - 4)

-35 + ( - 36)

- 35 - 36

- 71

Espero ter ajudado