How to add polynomials in brackets

Answer-

The innermost parentheses are calculated first, followed by the brackets that form the next layer outwards, followed by braces that form a third layer outwards. Within and outside of parentheses, brackets, and braces, you then follow the normal order of operations as laid out by PEMDAS or other acronyms.

I hope this helps you!!!

Ithink is the abswer b