Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
cwrw238
Group Title
I'm helping my nephew with a function question and i'm stuck on one part  I should know this really.
f(x) = x^2  19, domain = (INF, 0)
g(x) = 1 (1/2) x, domain = (6, INF).
Find range of f and g which i found to be
(19, INF) and (INF, 2).
Find fg  which I got to be (1  (1/2)x)^2  19.
Write down the domain and range of fg.
 i'm a bit confused about this part.
 one year ago
 one year ago
cwrw238 Group Title
I'm helping my nephew with a function question and i'm stuck on one part  I should know this really. f(x) = x^2  19, domain = (INF, 0) g(x) = 1 (1/2) x, domain = (6, INF). Find range of f and g which i found to be (19, INF) and (INF, 2). Find fg  which I got to be (1  (1/2)x)^2  19. Write down the domain and range of fg.  i'm a bit confused about this part.
 one year ago
 one year ago

This Question is Closed

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
I've done this stuff before but cant remember this bit.
 one year ago

hsmt Group TitleBest ResponseYou've already chosen the best response.0
hi. i think i can help. consider the intersection of the two domains
 one year ago

hsmt Group TitleBest ResponseYou've already chosen the best response.0
what is the intersection of the two domains?
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
well they dont intersect  which makes me think that the domain is that of g (6, INF)
 one year ago

hsmt Group TitleBest ResponseYou've already chosen the best response.0
the domain is the null set. and thus, it has not range either
 one year ago

hsmt Group TitleBest ResponseYou've already chosen the best response.0
it has no* range either
 one year ago

hsmt Group TitleBest ResponseYou've already chosen the best response.0
does that make sense to you?
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
hmm  not sure to be honest  i'm not saying you're wrong  but i'll have to go back to the books thanx for your comments
 one year ago

hsmt Group TitleBest ResponseYou've already chosen the best response.0
sure, the product, quotient and sums of two functions need to have intersecting domains
 one year ago

hsmt Group TitleBest ResponseYou've already chosen the best response.0
otherwise the function is not defined. I hope that helps. Take care.
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
I've checked this out  because the domain of 'inner' function is (6.infinity) the composite function must have same domain  they intersect at that range of values hers a rough (lol) drawing
 one year ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
dw:1348438040718:dw
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.