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

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

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

AriMBest 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..
 7 months ago

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

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

myininayaBest ResponseYou've already chosen the best response.1
Does he mean formula?
 7 months ago

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

AriMBest 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
 7 months ago

AriMBest 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.
 7 months ago

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

myininayaBest ResponseYou've already chosen the best response.1
Yep You could have factored or used the quadratic formula.
 7 months ago

myininayaBest 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
 7 months ago
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