ANYONE GOOD AT ALGEBRA? please help :)

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linsey0689
linsey0689 Posts: 753 Member
in Chit-Chat
s=(r((6+i)^n-6))/i

I need to solve for r

s=r(6+i)^n-6) then that all over "i" as a fraction

please help me understand how to do this. ty so much :)
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Replies

  • endoftheside
    endoftheside Posts: 568 Member
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    si=r(6+i)^n -6
    si+6 = r(6+i)^n
    (si+6)/((6+i)^n) = r

    Since there is only one r, you need to separate all the other stuff from around the r, paying attention to order of operations to keep the right things together.

    First multiply both sides by i, cancelling out the i on the right side. Then add 6 to both sides, cancelling out the 6 on the right side. Then multiply by 1/(6+i)^n on both sides, cancelling it out on the right side and leaving only r.
  • hzliiz
    hzliiz Posts: 166 Member
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    My brain just cramped up reading that. :ohwell:
  • asia_hanebach
    asia_hanebach Posts: 275 Member
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    si=r(6+i)^n -6
    si+6 = r(6+i)^n
    (si+6)/((6+i)^n) = r

    Since there is only one r, you need to separate all the other stuff from around the r, paying attention to order of operations to keep the right things together.

    First multiply both sides by i, cancelling out the i on the right side. Then add 6 to both sides, cancelling out the 6 on the right side. Then multiply by 1/(6+i)^n on both sides, cancelling it out on the right side and leaving only r.

    Looks good to me!
  • Monkey_Business
    Monkey_Business Posts: 1,800 Member
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    Wow,
    I thought I was getting old! I actually understood that :-)
  • silvergurl518
    silvergurl518 Posts: 4,123 Member
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    2x2 = 4
    1x0 = 0
    u + me = us (calculus)
  • Warchortle
    Warchortle Posts: 2,197 Member
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    Yahoo answers is not MFP.
  • jjinteso
    jjinteso Posts: 2,060 Member
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    The first answer was absloluely correct. That was an easy one. Have anything harder?
  • debbash68
    debbash68 Posts: 981 Member
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    si=r(6+i)^n -6
    si+6 = r(6+i)^n
    (si+6)/((6+i)^n) = r

    Since there is only one r, you need to separate all the other stuff from around the r, paying attention to order of operations to keep the right things together.

    First multiply both sides by i, cancelling out the i on the right side. Then add 6 to both sides, cancelling out the 6 on the right side. Then multiply by 1/(6+i)^n on both sides, cancelling it out on the right side and leaving only r.
    Awwww just what I was going to say......probs
  • Warchortle
    Warchortle Posts: 2,197 Member
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    Also, if someone failed to mention remember that i = sqr -1

    Depends on the teacher, but some may want you to give the answer in rational form.
  • Chief_Rocka
    Chief_Rocka Posts: 4,710 Member
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    Do your own homework
  • InForBacon
    InForBacon Posts: 1,508 Member
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    2x2 = 4
    1x0 = 0
    u + me = us (calculus)


    2gether_zps5e035596.jpg
  • LassoOfTruth
    LassoOfTruth Posts: 735 Member
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    WOW, I feel stupid now.
  • sherrirb
    sherrirb Posts: 1,714 Member
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    1340050882014_3068657.png

    findx1.png

    ^^ This is so me!
  • LassoOfTruth
    LassoOfTruth Posts: 735 Member
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    1340050882014_3068657.png

    findx1.png

    False, aliens DO wear hats. Irrational... and more math words. Lolz.
  • jjinteso
    jjinteso Posts: 2,060 Member
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    1340050882014_3068657.png

    findx1.png

    x= 5
  • _DreDay_
    _DreDay_ Posts: 40
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    1340050882014_3068657.png

    findx1.png

    ^^Yes. :wink:
  • Angie80281
    Angie80281 Posts: 444 Member
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    si=r(6+i)^n -6
    si+6 = r(6+i)^n
    (si+6)/((6+i)^n) = r

    Since there is only one r, you need to separate all the other stuff from around the r, paying attention to order of operations to keep the right things together.

    First multiply both sides by i, cancelling out the i on the right side. Then add 6 to both sides, cancelling out the 6 on the right side. Then multiply by 1/(6+i)^n on both sides, cancelling it out on the right side and leaving only r.

    I think it may be more complicated on that, depending on how the problem is supposed to read. OP originally posted

    s=(r((6+i)^n-6))/i

    followed by

    s=r(6+i)^n-6) then that all over "i" as a fraction

    In the second version, there is one too many ")". In the first, if accurate, the entire ((6+i)^n-6) would be multiplied by "r", preventing you from simply adding 6 to both sides of the equation.

    If I'm incorrect, please let me know. I'm blonde and it's still early.

    ETA: If it IS supposed to be written the way you interpretted it, I agree with your math completely.
  • faster_than_flash
    faster_than_flash Posts: 114 Member
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    First answer is correct.

    Grab a ti-89 calculator - It can solve and check this for you.

    Also look at wolframalpha.com.

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