Question

If f(x) = x + 5, for what value of x does f(4x) = f(x + 4)?​

Answer 1

Answer:

x = 4/3

Step-by-step explanation:

To solve find f(4x) and f(x+4).  You should get  f(4x) = 4x + 5  and  f(x+4) = x + 9.  Now, set the two equations equal to each other.

f(4x) = f(x + 4)

4x + 5 = x + 9

3x = 4

x = 4/3