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 one year ago
Using the quadratic function, provide the x intercepts of x^2+4x21
Can someone just tell me what the quadratic function is..?
 one year ago
Using the quadratic function, provide the x intercepts of x^2+4x21 Can someone just tell me what the quadratic function is..?

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

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

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

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

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

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

myininaya
 one year 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
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