Question

Dada função f (x) = 1 - 5/2 . x, calcule:

a) f(-1) =
b)fof(2)=
c) f(1/5)=

Answer 1

a)  f(-1) 
1 - (5/2 × -1)
1 - (-5/2)
1 + 5/2
2/2 + 5/2 = 7/2 = 3,5

b) f(f(2));

f(2) = 1 - (5/2 × 2)
= 1 - 5
= -4 

f(-4)
1 - (5/2 × -4)
1 - (-10)
1 + 10
11

C)  f(1/5) 
1 - (5/2 × 1/5)
1 - (5/10)
1 - 0,5
0,5