Question

i dont understand why sometimes you have to use a brachett [] and sometimes ().... how do i know which one to use?

Answer 1

it's only when you have to put two brackets in a expression, and you want to make it clearer. there's no specific reason, (i think) :P

Answer 2

brackets group items that beling to a given ...well, group

Answer 3

you read brackets from the inside out

Answer 4

if your discussing interval notation tho...

Answer 5

think of [] as an equals sign connected by a line

Answer 6

when doing grouping in algebraic expressions
()
[]
these are them same
it doesn't matter which ones you use
------------
()
[]
these have different notation when talking about sets

Answer 7

when the interval is EQUAL to, use [ ], otherwise use ( )

Answer 8

i bet the question is about solving something like
\[3<x\leq 5\] solution is
\[(3,5]\] closed for less than or equal to, open for strict inequality. that is
( or ) if it is < or > and [ or ] if it is
\[\leq\] or
\[\geq\]

Answer 9

so if i dont have the equal to sign then i dont use [] right?

Answer 10

exactly..

Answer 11

or to say it positively, if you have equal sign use [ and if you don't use (

Answer 12

if its equal to, use [ ], otherwise dont

Answer 13

okay thanks again this explains alot