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anonymous

  • one year ago

need help with a couple of algebra questions. Will fan and Medal!

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  1. anonymous
    • one year ago
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    @JoannaBlackwelder

  2. JoannaBlackwelder
    • one year ago
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    Ok, what are your questions?

  3. anonymous
    • one year ago
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    9x^2 - 16x + 60 = 0 Part A: Describe the solution(s) to the equation by just determining the radicand. Show your work. (3 points)

  4. anonymous
    • one year ago
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    how do you determine the radicand?

  5. JoannaBlackwelder
    • one year ago
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    That is the part in the quadratic equation that is under the radical. b^2-4ac

  6. anonymous
    • one year ago
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    so you would just plug in and solve?

  7. JoannaBlackwelder
    • one year ago
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    Yep. If the radicand is positive, that means that the solution(s) will be two real solutions.

  8. JoannaBlackwelder
    • one year ago
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    If it is 0, then the solution is one real solution.

  9. JoannaBlackwelder
    • one year ago
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    And if it is negative, there will be two imaginary solutions.

  10. JoannaBlackwelder
    • one year ago
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    So, what do you get?

  11. JoannaBlackwelder
    • one year ago
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    Hm, that's not what I get. Check your signs.

  12. anonymous
    • one year ago
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    I will show you my work

  13. JoannaBlackwelder
    • one year ago
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    Sure :-)

  14. anonymous
    • one year ago
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    9x^2-16x+60=0 -16^2-4(9)(60) -16^2-4(540) 256-2160 -1904

  15. JoannaBlackwelder
    • one year ago
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    Yep, that's what I get. :-)

  16. JoannaBlackwelder
    • one year ago
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    So, what type are the solutions?

  17. anonymous
    • one year ago
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    ok, so that would be the radicand?

  18. JoannaBlackwelder
    • one year ago
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    Yep

  19. anonymous
    • one year ago
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    Solve 4x2 + 8x - 5 = 0 by using an appropriate method. Show the steps of your work, and explain why you chose the method used. (4 points)

  20. anonymous
    • one year ago
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    I chose to solve by completing the square but I forgot how to solve it can you help?

  21. anonymous
    • one year ago
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    I have a really bad memory:(

  22. JoannaBlackwelder
    • one year ago
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    Hm, you can do it that way, but I think the quadratic formula would be easier.

  23. anonymous
    • one year ago
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    ok

  24. anonymous
    • one year ago
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    I am looking at the steps from this link http://assets.openstudy.com/updates/attachments/5567650be4b01de5673a8a96-vocaloid-1432844914043-screenshot20150528at4.28.10pm.png

  25. anonymous
    • one year ago
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    would it be okay if I had a negative for c instead of a positive?

  26. anonymous
    • one year ago
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    are you still there?

  27. JoannaBlackwelder
    • one year ago
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    At that link, you just need the step on the bottom right. The rest is deriving the formula.

  28. anonymous
    • one year ago
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    oh ok

  29. JoannaBlackwelder
    • one year ago
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    And any of the terms can be positive or negative :-)

  30. anonymous
    • one year ago
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    |dw:1432923772865:dw|

  31. anonymous
    • one year ago
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    this is what I have. What do I do now?

  32. JoannaBlackwelder
    • one year ago
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    No, that's not what I get. Check your signs under the radical.

  33. anonymous
    • one year ago
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    I will show you my work

  34. JoannaBlackwelder
    • one year ago
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    Sounds good

  35. anonymous
    • one year ago
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    |dw:1432923987899:dw|

  36. JoannaBlackwelder
    • one year ago
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    |dw:1432924306758:dw| Very close though!

  37. anonymous
    • one year ago
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    |dw:1432924501938:dw| so it would be this

  38. JoannaBlackwelder
    • one year ago
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    Yep, but that can simplify more.

  39. anonymous
    • one year ago
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    I got -4/8=-0.5 and -20/8=-2.5

  40. JoannaBlackwelder
    • one year ago
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    Yep, awesome! :D

  41. anonymous
    • one year ago
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    An Labrador leaps over a hurdle. The function f(t) represents the height of the Labrador above the ground, in inches, at t seconds: f(t) = -16t2 + 26t A foxhound jumps over the same hurdle. The table shows the height of the foxhound above the ground g(t), in inches, at t seconds: Time (t) g(t) 0 0 0.4 5.44 0.6 6.24 0.7 6.16 0.8 5.76 1.0 4 1.2 0 Part A: Compare and interpret the maximum of f(t) and g(t)? (4 points) Part B: Which function has a greater x-intercept? What do the x-intercepts of the graphs of f(t) and g(t) represent? (4 points) Part C: Determine the y-intercepts of both functions and explain what this means in the context of the problem. (2 points)

  42. anonymous
    • one year ago
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    this is what I got Part A: The max of g(t) occurs when t=0.6 seconds, for f(t) since the parabola is concave down due to the negative sign. Then we know that there is a max on the parabola, the max for f(t) occurs at (13/16,169/16) 169/6=10.5625 inches at time 0.8125 seconds. Part B: The function that has a greater x- intercept is f(t), meaning that when the Labrador will land later than the fox when it jumps over the hurdle. Part C: I need help with part c

  43. JoannaBlackwelder
    • one year ago
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    I'll be back on later

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