**Question**

17) Here is a function.

a) The

Write an algebraic expression, in terms of

**output**of function A is*x*.Write an algebraic expression, in terms of

*x*, for the input of function A**[2 marks]**

b) A number,

*k*, is put into function A.

The output is also

*k*.

Find the value of

*k*.

**[3 marks]**