-x+8

----- (greater than or equal) 0

x-7

Do the problem I get x=8 and x=7

I graph it, and test it, and am wondering what exactly is the rule for when to put () or []

My understanding is that since it is a (greater than or equal) sign it should be []

But, the answer states it is (7,8] and Im not sure why.

I read something that if a number in the solution makes the denominator 0 then you must include it with () and I would have gotten it wrong as I was going to enter it as [7,8]

Is it basically this? if a number that is the solution on my graph makes the original equations denominator 0 then that number will have a () by it?

Maybe someone can dumb it down for me