Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

mathtard

  • 4 years ago

Find the vertex f(x)= 3x^2-18x+3 please help me. Awards will be given

  • This Question is Closed
  1. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    use the all mighty formula \[x= -\frac{b}{2a}\] to find the first coordinate

  2. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    in this case \[a=3,b=-18\] so \[-\frac{b}{2a}=-\frac{-18}{2\times3}=3\]

  3. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    that is the first coordinate and the second coordinate is what you get when you replace x by 3. you get \[3\times 3^2-18\times 3+3=27-54+3=-27+3=-24\] check my arithmetic because it is late

  4. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    also because i didn't really compute. as soon as i saw 27 i knew the next one would be -54. always works that way

  5. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    vertex is (3,-24) unless i messed up

  6. mathtard
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so (3,-24) ? and that would make it a maximum right?

  7. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    heck no

  8. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    this is a parabola that faces up. no max, but a min

  9. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1314675140476:dw|

  10. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the minimum value is -24

  11. mathtard
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ah I got it mixed up!

  12. mathtard
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I always do that with the minimum maximum.

  13. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy