anonymous
  • anonymous
Using the quadratic function, provide the x intercepts of x^2+4x-21 Can someone just tell me what the quadratic function is..?
Mathematics
jamiebookeater
  • jamiebookeater
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myininaya
  • myininaya
The quadratic function you have is x^2+4x-21 The graph will be a parabola
myininaya
  • myininaya
To find the x-intercepts, set your quadratic expression(function) equal to 0. Then solve for x.
anonymous
  • anonymous
hmm thats what i did @myininaya and i got x = -7 and 3 but the teacher wrote -2 and use quadratic function..

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myininaya
  • myininaya
What is -2 suppose to be ? Your x-intercepts are correct for this quadratic function.
anonymous
  • anonymous
Oh im just saying he took off 2 points and wrote use quadratic function.
myininaya
  • myininaya
Does he mean formula?
myininaya
  • myininaya
The quadratic formula is \[x=\frac{-b \pm \sqrt{b^2-4ac}}{2a} \]
anonymous
  • anonymous
hmm ill try it.
anonymous
  • anonymous
Thanks for your help
myininaya
  • myininaya
Np. Good luck.
anonymous
  • anonymous
tnx
anonymous
  • anonymous
oh if you do the quadratic function you get 3 and -7. Can you check that for me? @myininaya
anonymous
  • anonymous
actually, never mind. I see his point but you could have just done (x+7) (x-3) and gotten the intercepts that way.
anonymous
  • anonymous
do you write it as (3,0) and (-7,0) though?
myininaya
  • myininaya
Yep You could have factored or used the quadratic formula.
myininaya
  • myininaya
It is more proper to say the x-intercepts are (3,0) and (-7,0) I would say it is informal to say they are 3 and -7
anonymous
  • anonymous
Yea, i understand.
myininaya
  • myininaya
Coolness.

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