Question

f(x) = 2x+x/2, para x=8, f(8) é igual a

Answer 1

$f(x) = 2x+ \frac{x}{2} \\\\\\ f(8) = 2*(8)+ \frac{8}{2} \\\\f(8) =16+4\\\\f(8)=20$

Answer 2

f(x) = 2x + x
               2  

f(8) = 2.8 + 8
                2
f(8) = 16 + 4

f(8) = 20