I'm A junior in advanced algebra and need help w/functions!!

As posted, the question does not make sense to me.

Please post the EXACT question as it was presented to you - along with your thoughts and work (so that we know where to start)
 
okay,on my paper it says

f(x)=2x-5.......this is what I did to solve it! It gave mt the number 6 to put in as x!

f(6)=2(6)-5
f(6)=12-5
f(6)=7

RIGHT? Well what does the f have to do w/anything?????
 
FORGET THAT!

What about this one!

f(x)=x^2-4.....it gave me -2 to substitue for x! How do I do it???? I got -8 but nothing on my paper matches it.
 
This is not advanced algebra. Why is anyone calling it that?

The "f" is a convention to indicate a function. Its argument tells what to substitute or what variable is of interest.

Understanding function notation is very important. It is a fundamentally useful communication device.

If f(x) = 2*x - 4,
then f(3) = 2*3 - 4
so also f(1/2) = 2*(1/2) - 4
so also f(dog) = 2*(dog) - 4
so also f(house) = 2*(house) - 4
so also f(f(x)) = 2*(f(x)) - 4

\(\displaystyle (-2)^{2} = 4\) NOT -4
 
blndcountry2 said:
f(x)=2x-5, Well what does the f have to do w/anything?????
Click to expand...
f is the name given to the process.
So f(10) says to apply the process to 10: 2 times 10 minus 5.
Thus f(10) yeilds 15.
 
Here's an excellent example of a notation problem. Have you studied the "Order of Operations? I presume you have. That being the case, please rewrite your problem statement so it says what you mean. (Hint: More parentheses). After that, substitute away and show us what you get.
 
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