Math - Brackets Braces and Parentheses. Square brackets in mathematics are generally used for enclosing arguments of functions. The closed dot is at 0 and the open dot is at 4 and both dots are connected by a line.
Parentheses brackets and braces are ways of separating one part of an expression.
This article explains how. They are all grouping symbols. This is a commonly asked question in class this video has the answers. First calculate exponents and radicals then multiplication and division and finally addition and subtraction.