Question

If f(x) = 3(x+ 5) +4/x, what is f(a+2)?

A. 3(f (a) + 5) +4/f(a)+2

B. 3(a + 7) + 4/a+2

C. 3(a + 2) + 4/a + 2

Answer 1

B. 3(a + 7) + 3/(a + 2)

Explanation:

Just substitute (a+2) in for every (x) in the equation:

f(a + 2) = 3 ((a + 2) + 5) + 4/(a+2)

= 3 (a + 7) + 4/(a+2)