Question

Urgente, ajuda aeh, se possível coloquem cálculo

Answer 1

1)Tem que trocar os valores de x pelos do domínio:
$f(x)=5x+2$ / x=-3 => $f(-3)=5.(-3)+2$ => $f(-3)=-15+2$ => $f(-3)=-13$.
x=-2 => $f(-2)=5.(-2)+2$ => $f(-2)=-10+2$ => $f(-2)=-8$.
x=-1 => $f(-1)=5.(-1)+2$ => $f(-1)=-5+2$ => $f(-1)=-3$.
x=0 => $f(0)=5.0+2$ => $f(0)=2$.
x=1 => $f(1)=5.(1)+2$ => $f(1)=5+2$ => $f(1)=7$.
x=2 => $f(2)=5.(2)+2$ => $f(2)=10+2$ => $f(2)=12$.
x=3 => $f(3)=5.(3)+2$ => $f(3)=17$ => $f(3)=17$.
x=4 => $f(4)=5.(4)+2$ => $f(4)=20+2$ => $f(4)=22$.
I={ -8, -3, 2, 7, 12, 17, 22 }

2)$f(x)=x^2+2x$ 
a)$f(2)=2^2+2.2$ => $f(2)=4+4$ => $f(2)=8$.
b)$f(3)=3^2+2.3$ => $f(3)=9+6$ => $f(3)=15$.
c)$f(1)=1^2+2.1$ => $f(1)=1+2$ => $f(1)=3$