This problem is about combined operations. We have a square power, a subtraction and whole products.
To solve this we can use PEMDAS which is an strategy to remember the order of operations, that is, Parentheses, Exponents, Multiplication-Division, Addition-Subtraction, that's the right order to solve.-
[tex]9^2\cdot3\cdot1-3[/tex]According to PEMDAS, we solve the power first:
[tex]81\cdot3\cdot1-3[/tex]Then, we solve multiplications:
[tex]243-3[/tex]Finally, we subtract:
[tex]240[/tex]Therefore, the given expression is equal to 240.Just remember, PEMDAS dictates the right order to use operations.