Evaluate the contents of parentheses from the inside out. Pəˈrenthəsɪs uk pəˈrenthəsɪs plural parentheses a remark that is added to a sentence often to provide an explanation or extra information that is separated from the main part of the sentence by commas brackets or dashes. To separate numbers for clarity to indicate multiplication and to group numbers together.
The parentheses grouping is replaced by a -10 but the vertical line grouping is replaced by a 10.
In such a formula the subscript outside the parentheses means that to count atoms you must multiply that subscript by the numbers of atoms inside. Use nesting in formulas. When we see two or more numbers together that are separated by parentheses then the parentheses are telling us to multiply. One Al aluminum three N nitrogen and nine O oxygen.