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Math2400

  • one year ago

can someone help me solve this (easy but haven't done it in a while)

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  1. xcharlizea
    • one year ago
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    sure thing boo thangg

  2. Math2400
    • one year ago
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    \[0.27 = \frac{ 110^2 }{ (y-111)^2 (y-55) }\]

  3. xcharlizea
    • one year ago
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    o wtf

  4. xcharlizea
    • one year ago
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    lmaoo hold up gimme a min

  5. zepdrix
    • one year ago
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    What are we doin? +_+ solvin for y?

  6. Math2400
    • one year ago
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    yes haha

  7. zepdrix
    • one year ago
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    Multiply and divide some things,\[\Large\rm (y-111)^2 (y-55)= \frac{ 110^2 }{0.27 }\]Then I guess expand out all those brackets.

  8. zepdrix
    • one year ago
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    Then you get a cubic.... which.... might be hard to solve :d hmm

  9. Math2400
    • one year ago
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    wait it's supposed to be (y-110)^2 lol not 111/ but how do u do a cubic? LOL

  10. zepdrix
    • one year ago
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    \[\Large\rm (y-110)^2 (y-55)= \frac{ 110^2 }{0.27 }\]Well you know how you have your nice `quadratic formula` for dealing with squares? x= -b+/-sqrt(b^2-.... Well there is one for cubics, but it's extremely long and complex, not worth using most of the time. We could try applying rational root theorem to find a factor, and then factor it. If it doesn't factor, then..... oh boy +_+

  11. Math2400
    • one year ago
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    what is the equation for cubic? lol i think my professor wants us to know

  12. zepdrix
    • one year ago
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    i doubt it :) lol http://www.math.vanderbilt.edu/~schectex/courses/cubic/

  13. zepdrix
    • one year ago
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    it's the formula that's taking up two lines

  14. zepdrix
    • one year ago
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    near the top

  15. zepdrix
    • one year ago
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    or you could just cheat and use wolfram +_+ https://www.wolframalpha.com/input/?i=%28y-110%29%5E2%28y-55%29%3D110%5E2%2F0.27

  16. zepdrix
    • one year ago
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    it's a weird solution.. not one we could've come up with just by checking roots and stuff :d

  17. zepdrix
    • one year ago
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    There is probably some calculus techniques you could use to get really close to the solution... blah

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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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