Question

ajudem por favor
02 – Seja a função f: R → R dada por f(x) = 3x – 1, determine os valores numéricos
seguintes:
a) f(-2) =
b) f(-1) =
c) f(0) =
d) f(2) =

Answer 1

Letra A

$\begin{gathered}\boxed{\begin{array}{lr} \sf f(x) = 3x - 1 \\\sf f( - 2) = 3 \cdot ( - 2) - 1 \\\sf f( - 2) = - 6 - 1 \\\sf \red{ f( - 2) = - 7} \end{array}}\end{gathered}$

Letra B

$\begin{gathered}\boxed{\begin{array}{lr} \sf f(x) = 3x - 1 \\\sf f( - 1) = 3 \cdot ( - 1) - 1 \\\sf f( - 1) = - 3 - 1 \\\sf \red{ f( - 1) = - 4 } \end{array}}\end{gathered}$

Letra C

$\begin{gathered}\boxed{\begin{array}{lr} \sf f(x) = 3x - 1 \\\sf f( 0) = 3 \cdot 0 - 1 \\\sf f( 0) = 0 - 1 \\\sf \red{ f( 0) = - 1 } \end{array}}\end{gathered}$

Letra D

$\begin{gathered}\boxed{\begin{array}{lr} \sf f(x) = 3x - 1 \\\sf f( 2) = 3 \cdot 2 - 1 \\\sf f( 2) = 6 - 1 \\\sf \red{ f( 2) = 5} \end{array}}\end{gathered}$