You subtract another 3 youre going to get to negative 19. Also he understands that parentheses means whichever inside shall be computed first. For example you have a parenthetical element such as an in-text reference eg Elite Editing 2014.
Regardless of the operations being performed within them be sure to tackle the terms in parentheses as your first act when you attempt to simplify an expression.
Dive into the history and uses of. In math parentheses indicate that the terms inside should be calculated separately from the surrounding expression. Parentheses are used in mathematical expressions to denote modifications to normal order of operations precedence. The deal is that theres a specific process you.