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oryxncrake
Average Member

USA
7 Posts
Posted - 11/05/2009 :  01:19:03  Show Profile  Reply with Quote
can someone please show me step by step how to solve this

kx^5 is a term of the expansion (x+3)^7. find the value of k.

i know the formula i have to use to help me solve this is (x+y)^n=...nCk(x)^n-k(y)^k but i still cant get far
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Subhotosh Khan
Advanced Member

USA
9068 Posts
Posted - 11/05/2009 :  08:29:06  Show Profile  Reply with Quote
quote:
Originally posted by oryxncrake

can someone please show me step by step how to solve this

kx^5 is a term of the expansion (x+3)^7. find the value of k.

i know the formula i have to use to help me solve this is (x+y)^n=...nCk(x)^n-k(y)^k but i still cant get far

DUPLICATE POST

http://freemathhelp.com/forum/viewtopic.php?f=9&t=37116

What have you done with the hint I had provided on the other site?

What is the term that you get k = 2?
Edited by - Subhotosh Khan on 11/05/2009 08:32:03
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