A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Let f(x) = 3x^2 – x + 2 and g(x) = 5x^2 – 1. Find f(g(x)). Please explain it to me as well! Thanks :)
anonymous
 one year ago
Let f(x) = 3x^2 – x + 2 and g(x) = 5x^2 – 1. Find f(g(x)). Please explain it to me as well! Thanks :)

This Question is Closed

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1f(g(x))  work for the ' inside out'. g(x) replaces the x in f(x)

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1dw:1439234684746:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so, f(x) = 3x^2 – x + 2 and g(x) = 5x^2 – 1 becomes: f(x) = 3(5x^2 – 1)^2 – 5x^2 – 1 + 2

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1yes you are on the way but put parentheses around the 5x^2  1

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1 otherwise you'll get your signs wrong

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0f(x) = 3(5x^2 – 1)^2 – (5x^2 – 1) + 2?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1and its f(g(x)) not f(x)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ohhh okay okay so f(g(x)) = 3(5x^2 – 1)^2 – 5x^2 – 1 + 2

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1no  you have to distribute the  over the parentheses so its 5x2 + 1

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@welshfella after this question can you please help me?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1 (5x^2  1) = 5x^2 + 1

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i meant to type that but i hit copy and paste and put the old equation, sorry

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0f(g(x)) = 3(5x^2 – 1)^2 – 5x^2 + 1 + 2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0then do i just solve normally?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1yes but i guess they want you to expand that now 3(5x^2  1)^2 = 3(25x^4 10x^2 + 1)

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1then simplify 3(25x^4 10x^2 + 1)  5x^2 + 3 = 75x^4  30x^2 + 3  5x^2 + 3 combine like terms then thats it

anonymous
 one year ago
Best ResponseYou've already chosen the best response.03(5x^2  1)^2 expand: 3(25x^4 10x^2 + 1) simplify: 3(25x^4 10x^2 + 1)  5x^2 + 3 = 75x^4  30x^2 + 3  5x^2 + 3 that's all? not as hard as i thought. thank you!
Ask your own question
Sign UpFind more explanations on OpenStudy
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.