the brackets mean "do this first". for example, in: x(4+2) you would add 4+2 before multiplying it By x. you can also add brackets into brackets which do the same thing. it is not compulsory, but you may change the brackets for how far in they are. i.e {[(1)]}.
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Same as parentheses. Brackets are used simply as a different type of parentheses, to make it easier to match the left and the right side.
'Parentheses' is another word for 'brackets' = '()'
brackets
There are both "square" and "curly" brackets used in algebra. They are [] and {} respectively in type. Usually square brackets are used to group smaller numbers of terms than curly brackets, and even square brackets are used only to group quantities some of which are in parentheses. Thus a suitable use example would be {[(a - b)(c + d) - a2]/[(fg + hj)/[k(l/m)]}. Larger square brackets are also used to set off numbers in matrix format.
Parentheses are brackets which are rounded kind. Like the one below: ( ..... )