Question

The function defined by f(x) = (x + 7)/(2x + 5) Find f(4x) .

Answer 1

The question is given below as

`\begin{gathered} f(x)=(x+7)/(2x+5) \\ find, \\ f(4x) \end{gathered}`

Concept:

Substitute x with 4x in the function above

`\begin{gathered} f(x)=(x+7)/(2x+5) \\ f(4x)=(4x+7)/(2(4x)+5) \\ f(4x)=(4x+7)/(8x+5) \end{gathered}`

Hence,

The final answer is

`\Rightarrow f(4x)=(4x+7)/(8x+5)`