Question

8. Determine o sinal do produto: a) ( + ) . ( + ) = b) ( + ) . ( – ) = c) ( – ) . ( – ) = d) ( – ) . ( + ) = ​

Answer 1

Resposta:

a)+

b)-

c)+

d)-

Explicação passo-a-passo:

a) ( + 1) . ( + 1) = +1

b) ( + 1) . ( – 1) = -1

c) ( – 1) . ( – 1) = +1

d) ( – 1) . ( + 1) = -1