Answer is n^2+2
I attached a picture of my working out
I can't seem to find the ans to the question you posted and i think that you made a typo. after i modified it a little, it added up so i think this is the answer to your question
Answer: 137
Step-by-step explanation: 11^2−5+(4)(7)/4(3)
121−5+(4)(7)/4(3)
116+(4)(7)/4(3)
116+(28/4)(3)
116+(7)(3)
116+21
137