Hi purple mathers!
Ok, so if you've read my posts before, you know I'm a mom trying to help an LD son learn Algebra II. Personally, I never had to take it, so I have never seen some of this stuff before.
When I asked this question last time, a poster said she really couldn't help because there are at least 2 different things that this notation could mean. I didn't have the book with me at the time, so we were stuck.
Thankfully, the teacher is going to let him make up this and some other sheets that he just didn't get......so, alas, here it is.
The questions are like this: Graph each function - 1.) y = [[x+2]]
I didn't know what the double bracket thing meant. Now I have the book. So.......
It says, "The greatest integer, written f(x) = [[x]], is one kind of step function. The symbol [[x]] means the greatest integer less than or equal to x. For example, [[3.25]] = 3 and [[-4.6]] = -5."
Then it shows this picture with a bunch of lines with solid dots on one side and open dots on the other side.
So...yeah. Someone dumb it down for me ;p! I don't know how to apply the information to solve the problem.