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johnson32 Group Title

3x^2=7

  • one year ago
  • one year ago

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  1. Lukecrayonz Group Title
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    3x=sqrt(7) x=sqrt(7)/3

    • one year ago
  2. johnson32 Group Title
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    hi, i got the answer. not sure if anyone done math labs online, how do you input this

    • one year ago
  3. 03453660 Group Title
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    |dw:1349872076838:dw|

    • one year ago
  4. Lukecrayonz Group Title
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    034 what in the world is wrong with your x's lol

    • one year ago
  5. johnson32 Group Title
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    yes, i work this the same, however when inputing it online, coming back incorrect maybe the symbol

    • one year ago
  6. 03453660 Group Title
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    @Lukecrayonz hahaha why???

    • one year ago
  7. Lukecrayonz Group Title
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    Looks like a 2pi or 2r or something :P

    • one year ago
  8. 03453660 Group Title
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    what ever it looks like but its my habit

    • one year ago
  9. johnson32 Group Title
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    help, how to write the correct solution set (4-3x)^2=39?

    • one year ago
  10. Lukecrayonz Group Title
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    Expand (4-3x)^2

    • one year ago
  11. johnson32 Group Title
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    expand?

    • one year ago
  12. Frank1991 Group Title
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    If you expand it you get: (4-3x)*(4-3x)=9x^2 -24x +16

    • one year ago
  13. Frank1991 Group Title
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    and then = 9x^2 -24x +16 -39 =0=9x^2 -24x -23

    • one year ago
  14. Frank1991 Group Title
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    and use the abc formula

    • one year ago
  15. Frank1991 Group Title
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    i mean the Quadratic formula

    • one year ago
  16. Frank1991 Group Title
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    I'm dutch, sorry

    • one year ago
  17. johnson32 Group Title
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    @ Frank 1991yes I got what you where saying

    • one year ago
  18. johnson32 Group Title
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    i see what you have here, and i have similar, I guess I need to simplify this because it does not show in my options in labs

    • one year ago
  19. johnson32 Group Title
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    @Frank1991, i meant have to simplify all radicals. heck its multiply choice

    • one year ago
  20. johnson32 Group Title
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    use the square root property to solve for the equation. (x-9)^2=64

    • one year ago
  21. Frank1991 Group Title
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    in the last case you could say \[\sqrt{(x-9)^{2}}=\sqrt{64}=8=x-9\]

    • one year ago
  22. Frank1991 Group Title
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    so x = 8+9

    • one year ago
  23. johnson32 Group Title
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    @Frank1991, my answers are as yours, but when i type them in them in the computer labs they come back wrong.

    • one year ago
  24. Frank1991 Group Title
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    oh that is strange you could check what wolframalpha is saying

    • one year ago
  25. johnson32 Group Title
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    @Frank1991 sure thing

    • one year ago
  26. Frank1991 Group Title
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    Yes wolfram alpha is also saying something different

    • one year ago
  27. Frank1991 Group Title
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    I forgot about that a sqaure could also be negative

    • one year ago
  28. Frank1991 Group Title
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    so we got one answer but forgot about the second

    • one year ago
  29. johnson32 Group Title
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    yes

    • one year ago
  30. johnson32 Group Title
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    @Frank1991 .. thanks

    • one year ago
  31. johnson32 Group Title
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    The formula A=P (1+r)^2 gives the amount A in dollars that P dollars will grow to in 2 years interst rate r ( where r is given as a decimal), using compound intreset. What interest rate will cause $3000 to grow to $3370.80 in 2 years..

    • one year ago
  32. johnson32 Group Title
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    The formula S=16t^2 is used to approximate the distance S, in feet, that an object falls freely from the rest in t seconds. The height of a building is 1048 feet. How long would it take for an object to fall from the top?

    • one year ago
  33. Frank1991 Group Title
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    To the first question:3000=3370.8(1+r)^2 => 3000=3370.8 (r^2 +2r +1) => r^2 +2r +1 = 3000/3370.8 => r^2 +2r +(1-3000/3370.8) = 0 and solve this for r. Probably one of the answers is negative and that makes no sense

    • one year ago
  34. mayankdevnani Group Title
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    |dw:1349875404939:dw|

    • one year ago
  35. mayankdevnani Group Title
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    @johnson32 got it

    • one year ago
  36. Frank1991 Group Title
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    second one: 1048=16 *t ^2 => t = squarroot( 1048/16) = ...

    • one year ago
  37. Frank1991 Group Title
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    I hope it helped @johnson32

    • one year ago
  38. johnson32 Group Title
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    @Frank1991 , so you got 0% interest rate,

    • one year ago
  39. johnson32 Group Title
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    @mayankdevnani , yes thank you got that one solve already

    • one year ago
  40. mayankdevnani Group Title
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    ok

    • one year ago
  41. Frank1991 Group Title
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    no r is the intrest rate

    • one year ago
  42. johnson32 Group Title
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    @Frank1991 , I got 65.5 seconds for the object falling at

    • one year ago
  43. Frank1991 Group Title
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    so use the quadratic formula for: r^2 +2r +(1-3000/3370.8) = 0 and r would be your answer

    • one year ago
  44. johnson32 Group Title
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    got it

    • one year ago
  45. Frank1991 Group Title
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    oh the 3000 and 3370.8 should switch

    • one year ago
  46. Frank1991 Group Title
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    You obtain r = -2.06 or r=0.06

    • one year ago
  47. Frank1991 Group Title
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    r=-2.06 makes no sense because there is an increase not a decrease, so your final answer is 0.06

    • one year ago
  48. Frank1991 Group Title
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    got it? @johnson32

    • one year ago
  49. johnson32 Group Title
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    yes I got it, thank you

    • one year ago
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