TBNRfrags
  • TBNRfrags
(v-8)^2 help pl0x
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
Do you want to expand the expression?
Astrophysics
  • Astrophysics
\[(v-8)^2 \implies (v-8)(v-8)\]
anonymous
  • anonymous
Use the foil method.

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Owlcoffee
  • Owlcoffee
I'll give you a hint: \[(a-b)^2 = a^2 -2ab +b^2 \]
TBNRfrags
  • TBNRfrags
http://prntscr.com/7kj71y this is the whole thing...
anonymous
  • anonymous
Ah, its \[(3v-8)^2\]
anonymous
  • anonymous
Just rewrite it as \[(3v-8)^2 = (3v-8)(3v-8) = \]
anonymous
  • anonymous
Do you know how to use the foil method to expand?
TBNRfrags
  • TBNRfrags
No idea
anonymous
  • anonymous
You expand each term one by one.
anonymous
  • anonymous
\[(3v - 8)(3v - 8) = 3v*3v - 8*3v - 8*3v + 8*8\]
anonymous
  • anonymous
To approach binomial expansion of any order, you must first understand how the foil method works.
TBNRfrags
  • TBNRfrags
so its B?
anonymous
  • anonymous
But what about the v term?
anonymous
  • anonymous
After you combine the like terms, you should get something like\[9v^2-48v+64\]
anonymous
  • anonymous
The only time when the middle term cancels out is when the signs are opposite. Check out conjugate multiplication for more information.

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