help with operations with functions

[isaiah45798]

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]

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)
add to get f(1)+g(1)=(f+g)(1)
U can learn more here: http://www.purplemath.com/modules/fcnops.htm

[isaiah45798]

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]

do just like it shows in the link!!

[isaiah45798]

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]

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]

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