A community for students.
Here's the question you clicked on:
 0 viewing
AriM
 2 years ago
Using the quadratic function, provide the x intercepts of x^2+4x21
Can someone just tell me what the quadratic function is..?
AriM
 2 years ago
Using the quadratic function, provide the x intercepts of x^2+4x21 Can someone just tell me what the quadratic function is..?

This Question is Closed

myininaya
 2 years ago
Best ResponseYou've already chosen the best response.1The quadratic function you have is x^2+4x21 The graph will be a parabola

myininaya
 2 years ago
Best ResponseYou've already chosen the best response.1To find the xintercepts, set your quadratic expression(function) equal to 0. Then solve for x.

AriM
 2 years ago
Best ResponseYou've already chosen the best response.0hmm thats what i did @myininaya and i got x = 7 and 3 but the teacher wrote 2 and use quadratic function..

myininaya
 2 years ago
Best ResponseYou've already chosen the best response.1What is 2 suppose to be ? Your xintercepts are correct for this quadratic function.

AriM
 2 years ago
Best ResponseYou've already chosen the best response.0Oh im just saying he took off 2 points and wrote use quadratic function.

myininaya
 2 years ago
Best ResponseYou've already chosen the best response.1Does he mean formula?

myininaya
 2 years ago
Best ResponseYou've already chosen the best response.1The quadratic formula is \[x=\frac{b \pm \sqrt{b^24ac}}{2a} \]

AriM
 2 years ago
Best ResponseYou've already chosen the best response.0oh if you do the quadratic function you get 3 and 7. Can you check that for me? @myininaya

AriM
 2 years ago
Best ResponseYou've already chosen the best response.0actually, never mind. I see his point but you could have just done (x+7) (x3) and gotten the intercepts that way.

AriM
 2 years ago
Best ResponseYou've already chosen the best response.0do you write it as (3,0) and (7,0) though?

myininaya
 2 years ago
Best ResponseYou've already chosen the best response.1Yep You could have factored or used the quadratic formula.

myininaya
 2 years ago
Best ResponseYou've already chosen the best response.1It is more proper to say the xintercepts are (3,0) and (7,0) I would say it is informal to say they are 3 and 7
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.