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AriM
Group Title
Using the quadratic function, provide the x intercepts of x^2+4x21
Can someone just tell me what the quadratic function is..?
 11 months ago
 11 months ago
AriM Group Title
Using the quadratic function, provide the x intercepts of x^2+4x21 Can someone just tell me what the quadratic function is..?
 11 months ago
 11 months ago

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

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

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

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

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

myininaya Group TitleBest ResponseYou've already chosen the best response.1
Does he mean formula?
 11 months ago

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

AriM Group TitleBest ResponseYou've already chosen the best response.0
hmm ill try it.
 11 months ago

AriM Group TitleBest ResponseYou've already chosen the best response.0
Thanks for your help
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
Np. Good luck.
 11 months ago

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

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

AriM Group TitleBest ResponseYou've already chosen the best response.0
do you write it as (3,0) and (7,0) though?
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
Yep You could have factored or used the quadratic formula.
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
It 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
 11 months ago

AriM Group TitleBest ResponseYou've already chosen the best response.0
Yea, i understand.
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
Coolness.
 11 months ago
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