To evaluate the value of a function at given value of input, you should replace the variable given in the function with the value of input that is given, in your case it is x = 5.
For x = 5, we have
Similarly, you will be able to evaluate the value of the function for any other input given, which is assumed to be valid.
Hence option b: 63 is the correct option.
For more information, refer to the link given below: