excuse me, but if two numbers are enclosed in parentheses, next to each other does this mean to multiply them, it looks like this (-1)(-2) or what does it mean, also, could some explain to me what it means when there's an equation enclosed by brackets, kinda looks like this {3t+-(2)} so does the one in parentheses goes first or what?

Question

excuse me, but if two numbers are enclosed in parentheses, next to each other does this mean to multiply them, it looks like this (-1)(-2) or what does it mean, also, could some explain to me  what it means when there's an equation enclosed by brackets, kinda looks like this {3t+-(2)} so does the one in parentheses goes first or what?

anonymous · Answer

To answer your first question, yes. Any time you see something written next to a parenthesis and there is no operation like +,-,/ or anything written, it's assumed they are multiplied.
To answer your second question {} and [] are often used simply as parenthesis to make it more obvious which parenthesis are paired in a problem when you have more than one set. There's no difference between the two kinds. It's just supposed to make it easier to read.

anonymous · Answer

@SmoothMath thank you very much.

anonymous · Answer

=D My pleasure!