Question

Sendo n € IN, calcule o valor de x=(-1)^8n –(-1)^4n+7+(-1)^7n-2.(-1)^n

Answer 1

Ola Marcinha 

x = (-1)^(8n) - (-1)^(4n+7) + (-1)^(7n-2)*(-1)^n 

n par 

x = 1 - 1*(-1) + 1*1 = 1 + 1 + 1 = 3

n impar

x = 1 - 1*(-1) + -1*-1 = 1 + 1 + 1 = 3