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Denise

  • 5 years ago

5(4/5)^2+8(4/5)-6 =???

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  1. anonymous
    • 5 years ago
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    18/5

  2. Denise
    • 5 years ago
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    how did you get that

  3. anonymous
    • 5 years ago
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    see 5 (4/5)^2 is 5 (16/25) = 16/5

  4. anonymous
    • 5 years ago
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    8(4/5) = 32/5

  5. anonymous
    • 5 years ago
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    u add both f these u get 48/5

  6. anonymous
    • 5 years ago
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    then u subtract 6 which is (48/5) - 6 (48-30)/5 18/5

  7. anonymous
    • 5 years ago
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    got it?

  8. Denise
    • 5 years ago
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    thanks! I am trying to do relative minima and maxima problems

  9. Denise
    • 5 years ago
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    I am lost as hell!

  10. anonymous
    • 5 years ago
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    how old r u?

  11. Denise
    • 5 years ago
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    40

  12. Denise
    • 5 years ago
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    just went back to college

  13. anonymous
    • 5 years ago
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    kk

  14. anonymous
    • 5 years ago
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    ur my mums age almost

  15. Denise
    • 5 years ago
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    haha

  16. anonymous
    • 5 years ago
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    cn i help smwher?

  17. Denise
    • 5 years ago
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    that would be awesome

  18. Denise
    • 5 years ago
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    how do you determine when it is a minima or a maxima

  19. anonymous
    • 5 years ago
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    see lets take an example of a cubic function f(x)

  20. anonymous
    • 5 years ago
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    when you differentiate it to get f'(x) , u evaluate the roots of f'(x)

  21. anonymous
    • 5 years ago
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    these r called critical points...these are the points where it can be maximum or minimum..the function that is

  22. anonymous
    • 5 years ago
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    get it til here?

  23. Denise
    • 5 years ago
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    k.

  24. Denise
    • 5 years ago
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    got that

  25. anonymous
    • 5 years ago
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    so now to determine whether its max or min, what u do is u differentiate once more to get f''(x)..now plug in ur critical point into it

  26. Denise
    • 5 years ago
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    Are you going to be on here long today? I have about 60 problems I have to do.

  27. Denise
    • 5 years ago
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    What determines if it is maxima or minima?

  28. anonymous
    • 5 years ago
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    when u plug the point into f''(x), see the sign of the function

  29. Denise
    • 5 years ago
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    if its negative its min and positive max?

  30. anonymous
    • 5 years ago
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    if the sign of f"(x) is negative its maxima, and viceversa

  31. anonymous
    • 5 years ago
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    no the opposite

  32. Denise
    • 5 years ago
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    gotcha! Thanks a million!

  33. anonymous
    • 5 years ago
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    m not gonna b long inuf fr 60 problems..bt as much as i can

  34. Denise
    • 5 years ago
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    thanks I am afraid I will be on here all weekend

  35. anonymous
    • 5 years ago
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    no prob...well see wt we cn crack

  36. Denise
    • 5 years ago
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    According to th answer on mymathlab, the answer was -46/5.... how is that

  37. amistre64
    • 5 years ago
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    nuthin wrong with 40s :)

  38. anonymous
    • 5 years ago
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    well amistre check on that question she posted

  39. amistre64
    • 5 years ago
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    which one?

  40. anonymous
    • 5 years ago
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    right on top..

  41. Denise
    • 5 years ago
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    I really appreciate yall helping me!!!1

  42. amistre64
    • 5 years ago
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    5(4/5)^2+8(4/5)-6 =??? this one

  43. Denise
    • 5 years ago
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    yep

  44. anonymous
    • 5 years ago
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    yeah

  45. amistre64
    • 5 years ago
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    5x^2 +8x -6 is a parabola; that looks like a bowl sitting on the counter; it has a local minimum at its vertex; ....i sctually finished typing this reply like 40 seconds ago; slow response time i guess

  46. amistre64
    • 5 years ago
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    -b/2a = x compnent; -8/2(5) = -4/5 right?

  47. amistre64
    • 5 years ago
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    5(-4/5)^2+8(-4/5)-6 = y ^^^ use (-)4/5

  48. amistre64
    • 5 years ago
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    5(16/25) +8(-4/5)-6 = y

  49. anonymous
    • 5 years ago
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    yeah denise i thought it was 4/5 while actually its -4/5

  50. amistre64
    • 5 years ago
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    16 -32 -6 --------- = 5 5 1

  51. amistre64
    • 5 years ago
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    6(5) = 30 s000 (16-32-30)/5

  52. amistre64
    • 5 years ago
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    -46/5

  53. amistre64
    • 5 years ago
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    makes sense?

  54. anonymous
    • 5 years ago
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    yeah

  55. Denise
    • 5 years ago
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    k

  56. Denise
    • 5 years ago
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    where did the 6(5) come from???

  57. anonymous
    • 5 years ago
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    cz u take the lcm while subtracting

  58. Denise
    • 5 years ago
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    to get the 30

  59. amistre64
    • 5 years ago
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    yeah; fractions reguire you to be wearing the same pants; and that 6/1 is not dressup for company; so we got to changes its clothes to match .... we put it in 5 pants and find a top to match

  60. Denise
    • 5 years ago
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    lol!

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