## help with operations with functions

Quadratic equations and inequalities, variation equations, function notation, systems of equations, etc.
isaiah45798
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### help with operations with functions

Ok so f(x)={(3,5)(2,4)(1,7)}, and g(x)=sqrt(x-3). I have to figure out (f+g)(1). Any ideas? Thanks in advance.

little_dragon
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### Re: help with operations with functions

Ok so f(x)={(3,5)(2,4)(1,7)}, and g(x)=sqrt(x-3). I have to figure out (f+g)(1). Any ideas? Thanks in advance.
wat is f(1)? (get this from the set of pts)
wat is g(1)? (get this from the fcn)

isaiah45798
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### Re: help with operations with functions

Thank you very much. I have two more questions if someone is willing to help. Using the same f(x), how would I go about solving 1/f(x). And if k(x)=x^2+5 and g(x)=sqrt(x-3) how would I figure out (kg)(x).

little_dragon
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### Re: help with operations with functions

do just like it shows in the link!!

isaiah45798
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Joined: Sun Jul 17, 2011 12:00 am
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### Re: help with operations with functions

ok so that helped alot but i am having trouble understanding how to do the function operation with 1/f(x) due to the fact that f(x) has a list of points, f(x)={(3,5)(2,4)(1,7)}.

little_dragon
Posts: 226
Joined: Mon Dec 08, 2008 5:18 pm
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### Re: help with operations with functions

ok so that helped alot but i am having trouble understanding how to do the function operation with 1/f(x) due to the fact that f(x) has a list of points, f(x)={(3,5)(2,4)(1,7)}.
wat does f(3) equal? so wat is 1/f(3)?
do same w/ other 2 pts

isaiah45798
Posts: 8
Joined: Sun Jul 17, 2011 12:00 am
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### Re: help with operations with functions

so would it be 1/5,1/4,1/7. and by the way thankyou