Given: f (x) = x+2 and h (x) = 1/x-1

find 2f (x) - h (x)

All you have to do here is replace f (x) with x + 2 and h (x) with 1/x-1.

It's like plugging in a number for x, but instead you are plugging in a whole function instead of just a number. Whenever you are pluging something in, whatever it is, make sure it is in parentheses: () always!

Until your understanding of algebra becomes stronger.

2f (x) - hx

First lets plug in x + 2 for f (x). It's gonna look like this:

2 (x + 2) - h (x)

Notice how I put x + 2 in parentheses next to the 2, you

a l w a y s want to do this. Now we just do the same for h (x):

2 (x + 2) - (1/x - 1)

And that's it. That's all you have to do.