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anonymous

  • 5 years ago

(5-x)^1/2 = x+1 (show steps plz!)

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  1. anonymous
    • 5 years ago
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    How about I take you through it step by step instead?

  2. anonymous
    • 5 years ago
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    sounds good to me.

  3. anonymous
    • 5 years ago
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    Okay, so it's easier if you get rid of the 1/2 exponent, so square both sides.

  4. anonymous
    • 5 years ago
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    i did that and got 5-x= x^2+2x+1

  5. anonymous
    • 5 years ago
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    then set everything equal to 0

  6. anonymous
    • 5 years ago
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    0=x^2+3x-4

  7. anonymous
    • 5 years ago
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    factor that

  8. anonymous
    • 5 years ago
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    everything after is a blurr

  9. anonymous
    • 5 years ago
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    ok

  10. anonymous
    • 5 years ago
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    ummm yeah. i have no idea.

  11. anonymous
    • 5 years ago
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    Quadratic formula....

  12. anonymous
    • 5 years ago
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    all right. so when you factor you're going to get (x+y)(x-z)=0 where y and z are numbers, possibly the same number. You know you're going to subtract one of them and add one of them because if you look at the number that has no x's in it (-4) you subtract it. Did that much make sense?

  13. anonymous
    • 5 years ago
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    You can also use the quadratic formula, but I find factoring it easier.

  14. anonymous
    • 5 years ago
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    Factoring is easier, but for people who can't do that sort of factoring in their head, the quadratic formula is handy.

  15. anonymous
    • 5 years ago
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    Or at least it's easier if you understand factoring, which is definitely something you learn by practicing.

  16. anonymous
    • 5 years ago
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    Exactly!

  17. anonymous
    • 5 years ago
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    is that -(b)sqrt(b^2)-4(a)(c)/ 2(a)?

  18. anonymous
    • 5 years ago
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    That's true, I completely agree with you, Harwin. Sorry, slow typer apparently!

  19. anonymous
    • 5 years ago
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    (-b + sqrt(b^2 - 4ac))/2a and (-b - sqrt(b^2 - 4ac))/2a

  20. anonymous
    • 5 years ago
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    oh whoops yeah for got the +-

  21. anonymous
    • 5 years ago
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    Anyway, snooozzzzze knows how to get you through it. I'll give the show back to him.

  22. anonymous
    • 5 years ago
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    haha her, but that's ok. :) Do you want to use the quadractic formula, or try factoring?

  23. anonymous
    • 5 years ago
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    so does \[-11+-\sqrt{73}/8\] sound like its on the right track?

  24. anonymous
    • 5 years ago
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    Oh sorry. English really needs a genderless pronoun other than "it"....

  25. anonymous
    • 5 years ago
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    ha

  26. anonymous
    • 5 years ago
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    Use the quadractic formula on this equation: 0=x^2+3x-4

  27. anonymous
    • 5 years ago
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    oh shoot sorry i was looking at another equation

  28. anonymous
    • 5 years ago
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    That's very true. Not sure calling me it would have been better, but in any case it's not a big deal at all. RedCarr: No problem at all. Just try again with the right equation this time.

  29. anonymous
    • 5 years ago
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    how about \[-3+-\sqrt{57}/2\]?

  30. anonymous
    • 5 years ago
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    I'm not sure how you got the 57, but it's wrong.

  31. anonymous
    • 5 years ago
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    also, when you do it, make sure that you know that the 2 is over everything, not just the squareroot part.

  32. anonymous
    • 5 years ago
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    in place of the 57 would it be 25?

  33. anonymous
    • 5 years ago
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    that looks right to me.

  34. anonymous
    • 5 years ago
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    so x=1 and X=-8?

  35. anonymous
    • 5 years ago
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    No, this is what you should get: (−3+5)/2 (−3-5)/2

  36. anonymous
    • 5 years ago
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    ? i meant -4 but why the parenthesis?

  37. anonymous
    • 5 years ago
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    because otherwise you'd have written -3+5/2 which would simplify to -3+2.5=-0.5

  38. anonymous
    • 5 years ago
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    but yes, -4 and 1 is correct.

  39. anonymous
    • 5 years ago
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    except look at your original problem to see if they work.

  40. anonymous
    • 5 years ago
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    do you have a graphing calc with you? if you do plug in \[-3+\sqrt{25}\]

  41. anonymous
    • 5 years ago
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    because actually only one of them works in that case.

  42. anonymous
    • 5 years ago
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    I don't have a calculator, but I can visualize it.

  43. anonymous
    • 5 years ago
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    yeah only 1 does not the -4

  44. anonymous
    • 5 years ago
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    right, and that's because when we started the problem we squared both sides, which gave us the extra answer.

  45. anonymous
    • 5 years ago
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    well when i plugged it in my answer was 2. then i divided that 2 by 2 to get 1 which is the only answer.

  46. anonymous
    • 5 years ago
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    I'm sorry, could you restate that? I'm not really sure what you mean.

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