# Functions

• Aug 13th 2012, 04:50 AM
terone71
Functions
I got these questions wrong in my test. Can someone explain this to me please???
f(x)-->(3x-2)/(x+2)

Find f '(x)

Find f '(2)

f:x-->2x+5, g:x-->(1/2)x

Find f(g:x)

Find g(f:x)
• Aug 13th 2012, 04:55 AM
skeeter
Re: Functions
Quote:

Originally Posted by terone71
I got these questions wrong in my test. Can someone explain this to me please???
f(x)-->(3x-2)/(x+2)

Find f '(x)

Find f '(2)

f:x-->2x+5, g:x-->(1/2)x

Find f(g:x)

Find g(f:x)

show what you did and someone may be able to spot your mistake(s) , if any.

also, what does the notation f:x indicate ?
• Aug 13th 2012, 05:00 AM
terone71
Re: Functions
That is what I don't know. It came in the test but the teacher didn't teach this because he left the school without completing the syllabus. Please teach it....
• Aug 13th 2012, 05:43 AM
skeeter
Re: Functions
the first question involves calculus ... taking the derivative of a rational function f(x) using the quotient rule, then evaluating the value of that derivative f'(x) at x = 2, f'(2).

I believe the second function involves function composition.

I recommend you google the above topics and research how to do them yourself.