Parentheses in an equation tell you that you must perform that operation before any other operations, regardless of what operation that may be.
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The asterisk in a mathematical equation, usually in the context of a computer expression, means to multiply.
Parentheses, also known as brackets, show that whatever lies within them must be solved before anything else, and must be treated as a single chunk of an equation. For example: 2*(4+3) tells you to solve the '4+3' part of this problem first, which gives 2*7. If the brackets weren't there, the equation would be 2*4+3, which equals 8+3, or 11.
if it has an equal sign then it is an equation
Parentheses separate calculations to be performed independent of a larger equation. The resulting quantity then becomes subject to whatever other calculation is established outside the parenthese within that equation. Parentheses within parentheses work the same way, beginning with the most interior groupings until ultimately everything inside the outer parentheses becomes a single quantity.
None. Brackets are used as an alternative to parentheses. Using different symbols makes it easier to locate matching parentheses or brackets.