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anonymous

  • one year ago

The equation f(x) = 3x2 − 24x + 8 represents a parabola. What is the vertex of the parabola? (−4, 152) (4, −40) (−3, 107) (3, −37)

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  1. anonymous
    • one year ago
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    i dont know what a parabola is

  2. anonymous
    • one year ago
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    @DanJS

  3. anonymous
    • one year ago
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    a symmetrical open plane curve formed by the intersection of a cone with a plane parallel to its side. The path of a projectile under the influence of gravity ideally follows a curve of this shape.

  4. DanJS
    • one year ago
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    you could complete the square to make the vertex equation form

  5. anonymous
    • one year ago
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    ok i know how to complete the sqaure

  6. anonymous
    • one year ago
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    8, 1\3

  7. DanJS
    • one year ago
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    y = a(x-h)^2 + k vertex at (h,k)

  8. anonymous
    • one year ago
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    huh?

  9. anonymous
    • one year ago
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    ive never heard of that

  10. anonymous
    • one year ago
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    this is so confusing

  11. DanJS
    • one year ago
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    the video that was linked is good

  12. anonymous
    • one year ago
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    ok ill watch it real quick brb

  13. DanJS
    • one year ago
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    If you havent done anything else yet , just plug in the numbers to that

  14. anonymous
    • one year ago
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    yea i dont get it

  15. DanJS
    • one year ago
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    \[y = ax^2 + bx +c\] x coordinate of the vertex will be \[\frac{ -b }{ 2a }\]

  16. DanJS
    • one year ago
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    b = -24 a = 3

  17. anonymous
    • one year ago
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    so divide that?

  18. DanJS
    • one year ago
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    yes, just calculate it, put in the , a and b, values

  19. anonymous
    • one year ago
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    ok ill do that now

  20. anonymous
    • one year ago
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    i got -8b\a

  21. DanJS
    • one year ago
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    X - Coordinate of Vertex \[\frac{ -b }{ 2a } = \frac{ -(-24) }{ 2*3 } = \frac{ 24 }{ 6 } = 4\]

  22. anonymous
    • one year ago
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    i have to leave in like 3 minutes should i just guess??

  23. anonymous
    • one year ago
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    wait its b ???

  24. DanJS
    • one year ago
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    The X coordinate for the vertex is -b/(2a) = 4 To get the Y-Coordinate for that X value, plug in x=4 into the original y = 3x^2 - 24x + 8

  25. DanJS
    • one year ago
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    well you dont have to do that, if the X coordinate is 4, there is only one choice

  26. anonymous
    • one year ago
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    i just turned it in, b is right :)

  27. DanJS
    • one year ago
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    yea just have to remember the \[\frac{ -b }{ 2a }\] for the x-coordinate of the vertex

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