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anonymous
 one year ago
Find a if the coefficient of x^7 in the expansion of (3x + a) ^12 is 228096
anonymous
 one year ago
Find a if the coefficient of x^7 in the expansion of (3x + a) ^12 is 228096

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triciaal
 one year ago
Best ResponseYou've already chosen the best response.1Paschal's Triangle Binomial Theorem

triciaal
 one year ago
Best ResponseYou've already chosen the best response.1dw:1441167013634:dw

triciaal
 one year ago
Best ResponseYou've already chosen the best response.1dw:1441167247659:dw

triciaal
 one year ago
Best ResponseYou've already chosen the best response.1dw:1441167559412:dw

triciaal
 one year ago
Best ResponseYou've already chosen the best response.1@jim_thompson5910 this looks messy but do you agree?

triciaal
 one year ago
Best ResponseYou've already chosen the best response.1@Zale101 is there a better way to do this?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0@triciaal you forgot about raising 3 to the 7th power

triciaal
 one year ago
Best ResponseYou've already chosen the best response.1@jim_thompson5910 in the substitution yes thanks

triciaal
 one year ago
Best ResponseYou've already chosen the best response.1dw:1441206453306:dw

triciaal
 one year ago
Best ResponseYou've already chosen the best response.1dw:1441206724641:dw

jmark
 one year ago
Best ResponseYou've already chosen the best response.0x^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/benefitofliteracy/
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