This is all about operations priority! We have to perform the operations in the right order, remembering that parentheses come first, then powers, then multiplications and then additions:
Start with

Perform the operations inside parenthesis first:

Perform the square:

Perform the product:

Perform the sum:

Note: you have an extra parenthesis at the end, and none of the options meets the result. I'm afraid that there's a typo in the question, but this should still give you a valid strategy to solve the actual exercise.
Answer:
x = 109 degrees
Step-by-step explanation:
180-48-23
I assume you mean least. That would be 8.