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johnson32

  • 3 years ago

3x^2=7

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  1. Lukecrayonz
    • 3 years ago
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    3x=sqrt(7) x=sqrt(7)/3

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

  3. 03453660
    • 3 years ago
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    |dw:1349872076838:dw|

  4. Lukecrayonz
    • 3 years ago
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    034 what in the world is wrong with your x's lol

  5. johnson32
    • 3 years ago
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    yes, i work this the same, however when inputing it online, coming back incorrect maybe the symbol

  6. 03453660
    • 3 years ago
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    @Lukecrayonz hahaha why???

  7. Lukecrayonz
    • 3 years ago
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    Looks like a 2pi or 2r or something :P

  8. 03453660
    • 3 years ago
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    what ever it looks like but its my habit

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

  10. Lukecrayonz
    • 3 years ago
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    Expand (4-3x)^2

  11. johnson32
    • 3 years ago
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    expand?

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

  13. Frank1991
    • 3 years ago
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    and then = 9x^2 -24x +16 -39 =0=9x^2 -24x -23

  14. Frank1991
    • 3 years ago
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    and use the abc formula

  15. Frank1991
    • 3 years ago
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    i mean the Quadratic formula

  16. Frank1991
    • 3 years ago
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    I'm dutch, sorry

  17. johnson32
    • 3 years ago
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    @ Frank 1991yes I got what you where saying

  18. johnson32
    • 3 years ago
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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

  19. johnson32
    • 3 years ago
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    @Frank1991, i meant have to simplify all radicals. heck its multiply choice

  20. johnson32
    • 3 years ago
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    use the square root property to solve for the equation. (x-9)^2=64

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

  22. Frank1991
    • 3 years ago
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    so x = 8+9

  23. johnson32
    • 3 years ago
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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.

  24. Frank1991
    • 3 years ago
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    oh that is strange you could check what wolframalpha is saying

  25. johnson32
    • 3 years ago
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    @Frank1991 sure thing

  26. Frank1991
    • 3 years ago
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    Yes wolfram alpha is also saying something different

  27. Frank1991
    • 3 years ago
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    I forgot about that a sqaure could also be negative

  28. Frank1991
    • 3 years ago
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    so we got one answer but forgot about the second

  29. johnson32
    • 3 years ago
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    yes

  30. johnson32
    • 3 years ago
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    @Frank1991 .. thanks

  31. johnson32
    • 3 years ago
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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..

  32. johnson32
    • 3 years ago
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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?

  33. Frank1991
    • 3 years ago
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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

  34. mayankdevnani
    • 3 years ago
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    |dw:1349875404939:dw|

  35. mayankdevnani
    • 3 years ago
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    @johnson32 got it

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

  37. Frank1991
    • 3 years ago
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    I hope it helped @johnson32

  38. johnson32
    • 3 years ago
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    @Frank1991 , so you got 0% interest rate,

  39. johnson32
    • 3 years ago
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    @mayankdevnani , yes thank you got that one solve already

  40. mayankdevnani
    • 3 years ago
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    ok

  41. Frank1991
    • 3 years ago
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    no r is the intrest rate

  42. johnson32
    • 3 years ago
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    @Frank1991 , I got 65.5 seconds for the object falling at

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

  44. johnson32
    • 3 years ago
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    got it

  45. Frank1991
    • 3 years ago
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    oh the 3000 and 3370.8 should switch

  46. Frank1991
    • 3 years ago
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    You obtain r = -2.06 or r=0.06

  47. Frank1991
    • 3 years ago
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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

  48. Frank1991
    • 3 years ago
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    got it? @johnson32

  49. johnson32
    • 3 years ago
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    yes I got it, thank you

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