Please correct me if my answer is wrong... thanks

1. 6(11-(3+1)^2+3)
=-12

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Here is my working out
6(11-(4)^2+3
6(11-16+3)
6(-5+3)
6(-2)
-12

good work, for better form, place equal signs in front of each new line

You are saying "What I am about to write is equal to the previous line"

6(11-(4)^2+3
= 6(11-16+3)
= 6(-5+3)
= 6(-2)
= -12