How do I solve 12-[ (3²x4) - 30]

First you do

(3^2x4) which equals = 36

Secondly you do

[36-30] which equals = 6

Then you take out the brackets

12-6 which equals = 6

Here is the whole thing:

=12-[ (9x4) - 30]

=12-[36-30]

=12-6

=-6

Start with the first parenthesis wich is 3 two and 4 the exponent of the 3 means 3 three time so it would be 9 x 3 and that is 27 the move to the next parenthesis which is - 30 so 27 minus 30 is 3 so three is your anwser