Which of the following is the expansion of (x + 3)5?

x5 + 5x4 + 10x3 + 10x2 + 5x + 1

x5 + 3x4 + 9x3 + 27x2 + 81x + 243

x5 + 15x4 + 90x3 + 270x2 + 405x + 243

None of the above

Question

Which of the following is the expansion of (x + 3)5?

x5 + 5x4 + 10x3 + 10x2 + 5x + 1

 x5 + 3x4 + 9x3 + 27x2 + 81x + 243

 x5 + 15x4 + 90x3 + 270x2 + 405x + 243

 None of the above

anonymous · Answer

are you familiar with binomial series expansion ?

rayford · Answer

i have heard of it but i just wanted to know if i was correct and if not could you explain... i chose none of the above.

rayford · Answer

was i correct?

anonymous · Answer

nopes!

anonymous · Answer

x5 + 15x4 + 90x3 + 270x2 + 405x + 243  is correct !

anonymous · Answer

http://www.wolframalpha.com/input/?i=expand%28x%2B3%29%5E5

rayford · Answer

thanks man! i will def study :)

anonymous · Answer

yw:)