Question

dada a função f(x)=2x+5, determine:
f (-4)
f (3)
f(1/3)

Answer 1

I) f(-4) = 2. (-4) +5 
f(-4) = -8+5
f(-4) = -3

II) f(3) = 2 . (3) +5
f(3) = 6+5
f(3) = 11

III) f(1/3) = 2. $\frac{1}{3} +5$

f(1/3) = $\frac{2}{3} +5$

f(1/3) = $\frac{15+2}{3}$

f(1/3) = $\frac{17}{3}$

Answer 2

F(-4) =2(-4)+5 = -3
F(3) = 2x3+5 =11
F(1/3) = 2(1/3)+5 
          = 2/3+5
          =2+15/3
          =17/3