Question

Dada a função f: R→R tal que f(x) =5-x, calcule:
A) f(5). B) f(-2). C) f(3/2).

Answer 1

Basta substituir o valor de "x" pelos propostos

A) f(5)

$f(x)=5-x\\\\ f(5)=5-5\\\\ \boxed{f(5)=0}$

B) f(-2)

$f(x)=5-x\\\\ f(-2)=5-(-2)\\\\ f(-2)=5+2\\\\ \boxed{f(-2)=7}$

C) f(3/2)

$f(x)=5-x\\\\ f(\frac{3}{2})=5-\frac{3}{2}\\\\ \boxed{f(\frac{3}{2})=\frac{7}{2}}$