How to do squared subtraction

this week we have been doing reviews of operations so we had bundles and bundles of problems here was one of them this was the question 1st  as we know from a past blog post  we do the brackets first so 3+2 is 5 but then there's a little 2  that little 2 means  squared means times by itself so 5x5=25-7=18 so that's how you do square subtraction I found this hard because I had to series of these if you learnt anything to tell me in the comments or if you have any advice on how to do it a different way.