I am having an extremely difficult time with the whole function/graph concept.

I just cannot get it.

An example of my confusion:

f(x)=12x-2
f(2), f(4)

Why are there two f's? Where does the first f go? The second? Why? Is it always in the same order? Please help! I have a HUGE quiz on Thursday 6/24/10.

All f(x)=12x-2 is is a line with slope 12 and y intercept at y=-2.

The f(2) and f(4) means they just want you to plug in x=2 and x=4 into 12x-2. That's it.

Thanks.

This is where I am confused though. What do you mean "plug in?"

I was also asked to solve and example just like this but with different numbers. I don't get the whole slope, intercept, and plug lingo. I should mention that I came into this class much later than everyone else and never caught up (obviously). I appreciate the help. A lot! :)

Ok, an example:

If I tell you:

f(x) = 2x + 2.
Find f(1) and f(4)

This means, you have to replace x in the function by 1 and 4 respectively.

1st answer: f(1) = 2(1) + 2 = 2 + 2 = 4
2nd answer: f(4) = 2(4) + 2 = 8 + 2 = 10

Now, if we had something else:
f(x) = x^2 + x + 1
Find f(2)

f(2) = (2)^2 + (2) + 1 = 4 + 2 + 1 = 7

Is it good now? Can you post what are the answers you get from your question? :) Thanks!