Question

Sendo f(x)=x+1/2 a lei de formação da função , encontre: a) f(1)+f(3)= b)f(-1)+f(-3)=

Answer 1

a)

f(1) = 1 + 1/2 -> f(1) = 2/2 + 1/2 -> f(1) = 3/2

f(3) = 3 + 1/2 -> f(3) = 6/2 + 1/2 -> f(3) = 7/2

f(1) + f(3) = 3/2 + 7/2 = 10/2 = 5

b)

f(-1) = -1 + 1/2 -> f(-1) = -2/2 + 1/2 -> f(-1) = -1/2

f(-3) = -3 + 1/2 -> f(-3) = -6/2 + 1/2 -> f(-3) = -5/2

f(-1) + f(-3) = -1/2 + (-5/2) -> f(-1) + f(-3) = -6/2 = -3