1. The problem statement, all variables and given/known data The sixth term of the expansion of (x-1/5)n is -1287/(3125)x8. Determine n. 2. Relevant equations tk+1=nCkan-kbk 3. The attempt at a solution tk+1=nCkan-kbk t5+1=nC5(x)n-5(-1/5)5 This is where I'm stuck. Do I sub in -1287/(3125)x8 to = t6? If so what do I do from here? -1287/(3125)x8 = nC5(x)n-5(-1/5)5? Any help is greatly appreciated!