how to solve binomial expansion

[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.

thanks a bunch!

 

[Deleted member 4993]

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.

thanks a bunch!

\(\displaystyle (a +b)^n = \sum_{i=0}^{n} _nC_i \cdot a^i \cdot b^{n-i}\)