Math2400
  • Math2400
can someone help me solve this (easy but haven't done it in a while)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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xcharlizea
  • xcharlizea
sure thing boo thangg
Math2400
  • Math2400
\[0.27 = \frac{ 110^2 }{ (y-111)^2 (y-55) }\]
xcharlizea
  • xcharlizea
o wtf

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xcharlizea
  • xcharlizea
lmaoo hold up gimme a min
zepdrix
  • zepdrix
What are we doin? +_+ solvin for y?
Math2400
  • Math2400
yes haha
zepdrix
  • zepdrix
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.
zepdrix
  • zepdrix
Then you get a cubic.... which.... might be hard to solve :d hmm
Math2400
  • Math2400
wait it's supposed to be (y-110)^2 lol not 111/ but how do u do a cubic? LOL
zepdrix
  • zepdrix
\[\Large\rm (y-110)^2 (y-55)= \frac{ 110^2 }{0.27 }\]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 +_+
Math2400
  • Math2400
what is the equation for cubic? lol i think my professor wants us to know
zepdrix
  • zepdrix
i doubt it :) lol http://www.math.vanderbilt.edu/~schectex/courses/cubic/
zepdrix
  • zepdrix
it's the formula that's taking up two lines
zepdrix
  • zepdrix
near the top
zepdrix
  • zepdrix
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
zepdrix
  • zepdrix
it's a weird solution.. not one we could've come up with just by checking roots and stuff :d
zepdrix
  • zepdrix
There is probably some calculus techniques you could use to get really close to the solution... blah

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