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shaleiah

  • one year ago

@Nnesha

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  1. shaleiah
    • one year ago
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    Please help walk me through this.

  2. Nnesha
    • one year ago
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    alright ready! :PD

  3. Nnesha
    • one year ago
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    |dw:1443039690740:dw|

  4. Nnesha
    • one year ago
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    for the first part we need to find max in other words vertex point |dw:1443039751009:dw|

  5. Nnesha
    • one year ago
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    so use the formula to find c-coordinate of the vertex \[\huge\rm x=\frac{ -b }{ 2a }\] b=middle term a=leading coefficient

  6. Nnesha
    • one year ago
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    hmm 407 ??

  7. shaleiah
    • one year ago
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    Wait...

  8. shaleiah
    • one year ago
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    \[\frac{ 0.658 }{ 2(0.00407) }\]

  9. Nnesha
    • one year ago
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    don't forget the sign okay \[\frac{ -0.658 }{ 2(-0.00407) }\] now solve

  10. shaleiah
    • one year ago
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    80.83538084

  11. Nnesha
    • one year ago
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    something wrong i didn't get that o.O

  12. shaleiah
    • one year ago
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    I typed it in my ti-84 calculator, that's what I got..

  13. Nnesha
    • one year ago
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    try again put the parentheses

  14. Nnesha
    • one year ago
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    that's how you should type in ti 84 -(.658)/(2(-.000407))

  15. shaleiah
    • one year ago
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    \[-(\frac{ .658 }{ 2(-.000407) }= 808.3538084\]

  16. Nnesha
    • one year ago
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    yes right now that's x coordinate of vertex now substitute x for 808 to find y-coordinate into the original equation

  17. IrishBoy123
    • one year ago
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    |dw:1443040813328:dw|

  18. Nnesha
    • one year ago
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    what ?? o.O

  19. Nnesha
    • one year ago
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    hmm i mean \[y=-.000407x^2+.658x\] in this equation replace x with 808

  20. shaleiah
    • one year ago
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    265.948352

  21. Nnesha
    • one year ago
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    yes right we can round it so it would be 266 that would be the height

  22. Nnesha
    • one year ago
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    now for the 2nd part you need to find x-intercept(zeros ) of that quadratic equation

  23. Nnesha
    • one year ago
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    i'll like to use quadratic formula bec there are negative numbers

  24. shaleiah
    • one year ago
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    I'm not good at quadratic formulas:(

  25. Nnesha
    • one year ago
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    \[\huge\rm \frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\] quadratic formula a= leading coefficient b=middle term c=constant so justplugin

  26. Nnesha
    • one year ago
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    \[\huge\rm Ax^2+Bx+C\] quadratic equation a= leading coefficient b=middle term c=constant

  27. shaleiah
    • one year ago
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    \[\frac{ -.658 +\sqrt{.658^{2}-4(.00407)}}{ 2(266) }\]

  28. Nnesha
    • one year ago
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    don't forget the C which is 0 so 4ac would be 4(.000407)(0) and why did you replace a with 266 ?

  29. Nnesha
    • one year ago
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    the denominator is 2a so 2(????)

  30. shaleiah
    • one year ago
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    2(.000407)

  31. Nnesha
    • one year ago
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    yes right \[\frac{ -.658 +\sqrt{(.658)^{2}-4(.00407)(0)}}{ 2(.000407) }\] now oslve

  32. Nnesha
    • one year ago
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    solve**

  33. shaleiah
    • one year ago
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    807545.4545

  34. Nnesha
    • one year ago
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    please show you u got that that's not right you should get 2 solutions

  35. shaleiah
    • one year ago
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    I typed the equation directly in my ti-84 calculator

  36. shaleiah
    • one year ago
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    Do i solve them seperately?

  37. Nnesha
    • one year ago
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    hmm that wouldn't work how would you right plus minus sign in the calculator yes right solve the numerator the square root part

  38. shaleiah
    • one year ago
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    1.316

  39. shaleiah
    • one year ago
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    or .658?

  40. Nnesha
    • one year ago
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    both are wrong first solve square root \[\frac{ -.658 +\sqrt{\color{ReD}{(.658)^{2}-4(.00407)(0)}}}{ 2(.000407) }\] now just type the red part into the calculator

  41. shaleiah
    • one year ago
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    .432964

  42. Nnesha
    • one year ago
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    i just realized i'm the one who typed incorrectly sorry it's plus/minus \[\frac{ -.658 \pm \sqrt{\color{ReD}{(.43296)}}}{ 2(.000407) }\]

  43. Nnesha
    • one year ago
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    take the square root of .43296

  44. shaleiah
    • one year ago
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    oops

  45. Nnesha
    • one year ago
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    right so \[\huge\rm \frac{ -.658+6.58 }{ 2(-.000407) } and \frac{ -.658-.658 }{ 2(-.000407) }\] now we can seprate plus and minus sign and i found another typo a=negative .000407

  46. shaleiah
    • one year ago
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    .6579969605

  47. Nnesha
    • one year ago
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    that is same as .658 remember the number after 7 is greater than 5 so you can round it

  48. Nnesha
    • one year ago
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    this post is solaggy

  49. shaleiah
    • one year ago
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    yeah, lots of lag :(

  50. Nnesha
    • one year ago
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    \[\huge\rm \frac{ -.658+6.58 }{ 2(-.000407) } and \frac{ -.658-.658 }{ 2(-.000407) }\] alright work on this brb

  51. shaleiah
    • one year ago
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    Alright. I got 807545.4545

  52. shaleiah
    • one year ago
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    808

  53. Nnesha
    • one year ago
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    there are two fraction what did you get for first one what did you get for 2nd one

  54. Nnesha
    • one year ago
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    that doesn't looks right

  55. Nnesha
    • one year ago
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    use parenttheses

  56. shaleiah
    • one year ago
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    :c

  57. Nnesha
    • one year ago
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    what ?

  58. shaleiah
    • one year ago
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    are you sure the equation is set up correctly?

  59. Nnesha
    • one year ago
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    \[\huge\rm \frac{ -.658+6.58 }{ 2(-.000407) } and \frac{ -.658-.658 }{ 2(-.000407) }\] yes this one is 100% correct

  60. shaleiah
    • one year ago
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    The first fraction is: -7275... The second fraction is: -807545

  61. Nnesha
    • one year ago
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    ugh first fraction is .658 -.658 not (6.58) 2nd fraction is 100% right but no ur answer is not right for 2nd one

  62. Nnesha
    • one year ago
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    tell me what did you type into the calculator for first fraction

  63. shaleiah
    • one year ago
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    The 6.58 was the error :(

  64. Nnesha
    • one year ago
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    \[\huge\rm \frac{ -.658+.658 }{ 2(-.000407) } \] first one

  65. shaleiah
    • one year ago
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    0

  66. Nnesha
    • one year ago
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    right what about other one

  67. Nnesha
    • one year ago
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    hmm not correct what did you type into the caluclator ?

  68. shaleiah
    • one year ago
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    I'm sorry :/ I see the error. I re typed it and I got 1616.707617

  69. Nnesha
    • one year ago
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    yes that's right

  70. shaleiah
    • one year ago
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    Did we finish all the steps?

  71. Nnesha
    • one year ago
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    yep that's for 2nd part!

  72. Nnesha
    • one year ago
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    2nd one is `how long` so it would be 1616.71 0 wouldn't be the answer

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