swissgirl
  • swissgirl
How wld u find \( (a+2b)^4 \)
Mathematics
katieb
  • katieb
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swissgirl
  • swissgirl
The 2b is throwing me off here
anonymous
  • anonymous
how so?
campbell_st
  • campbell_st
what are you asked to do... expand...

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anonymous
  • anonymous
you want to expand it?
swissgirl
  • swissgirl
ya using binomail theorem
anonymous
  • anonymous
you can just substitute another variable for 2b and plug 2b into the final expansion: \[(a+c)^{4}\] where c = 2b
swissgirl
  • swissgirl
ya ok thanks
campbell_st
  • campbell_st
the coefficients will be 1 4 6 4 1 so its 1a^4 + 4a^3(2b) + 6a^2(2b)^2 + 4a(2b)^3 + (2b)^4
anonymous
  • anonymous
http://www.purplemath.com/modules/binomial.htm great stuff
swissgirl
  • swissgirl
oh yay. I like that link

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