A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
PLEASE HELP!!!
f(x) = x^2 + 4x − 1 in vertex form
anonymous
 one year ago
PLEASE HELP!!! f(x) = x^2 + 4x − 1 in vertex form

This Question is Closed

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1hint: you want to use completing the square ^_^

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I don't know how to do that.

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1dw:1439905794934:dw So now you want to plug b = 4 into the formula: \[(\frac{ b }{ 2})^{2} \] \[= (\frac{ 4}{ 2 }) ^2 = 2^2 = 4 \] Therefore to complete the square we have to add 4 \[f(x) = x^2 + 4x  1 \] \[= (x^2 + 4x + 4)  1 \] \[= (x + 2)^2 1\]

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1oh oops. i made an error

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1Correction: f(x)=x2+4x−1 =(x2+4x+4)−1  4 We have to subtract 4 since we added 4 to complete the square =(x+2)^2−14 = (x + 2)^2  5

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0lol nice, you pretty much got the concept down right though butterfly.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thank you so much for explaining that for me :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0can you help me with another question?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Which of the following values "completes the square," or creates a perfect square trinomial, for x^2 + 6x + ___? a. 1 b.3 c. 6 d.9

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1use the formula i showed you above :) dw:1439906543104:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so the final result would be x^2 + 6x +9?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thank you so much! :)

butterflydreamer
 one year ago
Best ResponseYou've already chosen the best response.1no problemo~ ^_^
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.