Given ()=52+1 and ()=2−3. Olivia was asked to find (()). She showed the following work:

Line 1: (())=(2−3)

Line 2: =522−3+1

Line 3: =522−2

This answer is incorrect. Answer the following questions:

On which line did Olivia make a mistake? Justify your answer.
Now show the correct way to solve this problem, showing all work like Olivia did above.