Question

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

Answer 1

f(a + 2)= 3a + $\frac{17}{2}$

substitute x = a + 2 into f(x)

f(a + 2) = 3(a + 2) +$\frac{5}{2}$

           = 3a + 6 + $\frac{5}{2}$ = 3a + $\frac{17}{2}$