A community for students.
Here's the question you clicked on:
 0 viewing
dang_thitham
 3 years ago
Find f(2) if f(x) = 2x2 + kx + 2 and f(1) = 3.
dang_thitham
 3 years ago
Find f(2) if f(x) = 2x2 + kx + 2 and f(1) = 3.

This Question is Closed

satellite73
 3 years ago
Best ResponseYou've already chosen the best response.0replace x by 1 and solve \[f(1)=2+k+2=3\] for k

abtrehearn
 3 years ago
Best ResponseYou've already chosen the best response.0We find what k is by plugging 1nfor x into the original function and setting the result equal to 3: 2*1^2 + k*1 + 2 = 3, so k = 1, and the function is\[f(x) = 2x^{2}  x + 2.\]We evaluate this function at x = 2: f(2) = 8.

dang_thitham
 3 years ago
Best ResponseYou've already chosen the best response.1so what is its' result?

abtrehearn
 3 years ago
Best ResponseYou've already chosen the best response.0I glitched. f(2) = 12.

satellite73
 3 years ago
Best ResponseYou've already chosen the best response.0looks like if you solve larger less than twice the smaller. make x the larger then we get \[2+k+2=3\] you get \[k=1\] yes? so now you have \[f(x)=2x^2x+2\] and if you want \[f(2)\] you compute \[f(2)=2(2)^2(2)+2\]

abtrehearn
 3 years ago
Best ResponseYou've already chosen the best response.0You use the information to find the value of f(2).

dang_thitham
 3 years ago
Best ResponseYou've already chosen the best response.1ok I understand now.Thanks
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.