anonymous
  • anonymous
Find a if the coefficient of x^7 in the expansion of (3x + a) ^12 is -228096
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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triciaal
  • triciaal
Paschal's Triangle Binomial Theorem
triciaal
  • triciaal
|dw:1441167013634:dw|
triciaal
  • triciaal
|dw:1441167247659:dw|

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triciaal
  • triciaal
|dw:1441167559412:dw|
triciaal
  • triciaal
@jim_thompson5910 this looks messy but do you agree?
triciaal
  • triciaal
@Zale101 is there a better way to do this?
jim_thompson5910
  • jim_thompson5910
@triciaal you forgot about raising 3 to the 7th power
triciaal
  • triciaal
@jim_thompson5910 in the substitution yes thanks
triciaal
  • triciaal
|dw:1441206453306:dw|
triciaal
  • triciaal
|dw:1441206724641:dw|
JMark
  • JMark
x^7 will be the 6th term. Hence, using binomial expansion 12C5*3^5*a^5*x^7 = 228096. Solving a^5 = 1.1852. Benefits of Literacy http://blog.tutorvista.com/2015/09/benefit-of-literacy/

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