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# @CPhill @Anyone who knows math???

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I'm totally confused with this binomial expansion, any idea????

https://gyazo.com/90a42d539cca62ca21a0b421d3246a61

Julius  Jun 1, 2017
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#1
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It is asking you to continue the pattern which in this case means that the top term is being multiplied by three while the bottom term is being divided by 2.

Guest Jun 1, 2017
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I am NO expert at this, but I think I found the original binomial,

and putting that into WolframAlpha gives the answer:

http://www.wolframalpha.com/input/?i=expand:+(x%2F2-1%2Fy)%5E7

Someone else can probably explain this the right way !! Haha

hectictar  Jun 1, 2017
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x^7 / 128 - 7x^6 / (64y)  +  21x^5 /  (32y^2)  - ......... -  1 / y^7

This is the binomial expansion  of

( x / 2   -   1 / y)^7

We have

C(7,0) (x/2)^7  -  C(7, 1) (x/2)^6 (1/y)  + C(7,2) (x /2)^5 (1/y)^2  -  ..... -  C(7,7) (1/y)^7

CPhill  Jun 1, 2017

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