Explicação passo-a-passo:
f(x)= 1/2 x +2
a) crescente pois a> 0
b) 0 = 1/2 x +2
- 2 = 1/2 x
- 2. 2 = 1x
- 4 = x
c) f(2)= 1/2 .2 +2
f(2)= 1 +2
f(2)= 3
f(-1)= 1/2. (-1) +2
f(-1)= - 1/2 +2
f(-1)= - 1 + 4/2
f(-1)= 3/2
f(2) + f(-1)=
3 + 3/2=
6 + 3
____=
2
9/2
