Brackets are marks used to group operations and mark the beginning and end of matrices. Brackets are always used in pairs. The left bracket looks like: [. The right bracket looks like: ].
Brackets are most often used to mark the beginning and end of matrices. For example: A = [ 5 -1 2 ].
Brackets are occasionally used to group operations in arithmetic, usually along with parentheses. For example, the expression 5·4+2 evaluates to 22. Using the order of operations, we first multiply 5 and 4 to get 20, and then add 2 to get 22.
However, if we use brackets write the expression as 5·[4+2], the value of the expression changes. The bracket tells us to add 4 to 2 before multiplying by 5. Adding 4 and 2 gives us 6. When we then multiply by 5 we get 30.
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