Question

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

Answer 1

$f(x)=3(x+5)+\dfrac{4}{x}\\\\\text{substitute x=a+2 to the equation of the function}\\\\f(a+2)=3(a+2+5)+\dfrac{4}{a+2}=3(a+7)+\dfrac{4}{a+2}=3a+21+\dfrac{4}{a+2}$

Answer 2

Answer:

$f(a+2)=3a+21+\frac{4}{a+2}$

Step-by-step explanation:

If $f(x)=3(x+5)+\frac{4}{x}$

Then we have to find f(a + 2)

Now we replace x by (a + 2) in the given expression.

f(a + 2) = 3[(a + 2) + 5] + $\frac{4}{a+2}$

           = 3(a + 7) + $\frac{4}{a+2}$

           = 3a + 21 + $\frac{4}{a+2}$

So the answer is $f(a+2)=3a+21+\frac{4}{a+2}$