Question

5- Encontre o valor das potências:
a) (-2)³ =
b) (-2)⁴=
c) (-5)²=​

Answer 1

→ Cálculo :

Regra de sinal :  

( - ) ( - ) = +    

( + ) ( + ) = +    

( - ) ( + ) = -    

( + ) ( -) = -

A) ( - 2 )³ = ( - 2 ) · ( - 2 ) · ( - 2 ) = -8

B) ( - 2)⁴ = ( - 2 ) · ( - 2 ) · ( - 2 ) · ( - 2 ) = +16

C) ( - 5 )² = ( - 5 ) · ( - 5 ) = +25