OpenStudy (anonymous):

Expand as a binomial series and simplify: (x+3)^7

7 years ago
OpenStudy (anonymous):

I got $x ^{7} +21x ^{6}+189x ^{5}+945x ^{4}+2835x ^{3}+5103^{2}+5103x+2187$I haven't worked with these before, so I was wondering if someone could check my work.

7 years ago
OpenStudy (anonymous): 7 years ago
OpenStudy (anonymous):

Interestingly 2187 is 3^7

7 years ago
jimthompson5910 (jim_thompson5910):

You have the correct answer. Good job.

7 years ago
jimthompson5910 (jim_thompson5910):

assuming you meant $5103x^{2}$

7 years ago