Question

3) Considere a função f: N----> N tal que f(x) = 3x – 5. Obtenha: a) f(13) = b) f(-20) = c) f(0) =

Answer 1

$f(x)=3x-5$


a) x=13, então

$f(x)=f(13)=3.(13)-5 \\ f(13)=39-5 \\ \\ f(13)=34$


b) x=-20

$f(x)=f(-20)=3.(-20)-5 \\ f(-20)=-60-5 \\ \\ f(-20)=-65$



c) x=0


$f(x)=f(0)=3.(0)-5 \\ f(0)=0-5 \\ \\ f(0)=-5$