Answer:
4
Step-by-step explanation:
The part of the function that is (2x - 1)² has a minimum value of 0. The reason is that any real number you for x will give you a positive, negative, or zero value for 2x - 1. When you square it, you must get a non-negative answer.
Then you add 4, and you get a value that is greater than or equal 4.