if f(x)=3x+5/x, what is f(a+2) ?
a. 3a+5/a+2
b. 3(a+2)+5/a+2
c. 3(f(a))+5/f(a+2)
2 Answers

f(x) = 3x + 5/x
f(a+2) = 3(a+2) + 5/(a+2)
If you need to use a common denominator, then you'd get:
f(a+2) = (3(a+2)² + 5)/(a+2) = (3a²+12a+17)/(a+2)

f(x)=3x+5/x
f(a+2)=3(a+2)+5/(a+2)