SOLUTION: Write in expanded form (a-3b)^4 please help me on this problem! I would really appreciate it!

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: Write in expanded form (a-3b)^4 please help me on this problem! I would really appreciate it!      Log On


   

Question 250828: Write in expanded form
(a-3b)^4


please help me on this problem! I would really appreciate it!
Answer by College Student(505) About Me  (Show Source):
You can put this solution on YOUR website!
%28a-3b%29%5E4

%28a-3b%29%5E2%28a-3b%29%5E2

%28a-3b%29%28a-3b%29%28a-3b%29%5E2

%28a%5E2-3ab-3ab%2B9b%29%28a-3b%29%5E2

%28a%5E2-6ab%2B9b%29%28a%5E2-6ab%2B9b%29

a%5E4-6a%5E3b%2B9a%5E2b-6a%5E3b%2B36a%5E2b%5E2-54ab%5E2%2B9a%5E2b-54ab%5E2%2B81b%5E2

Now combine like terms:
a%5E4-6a%5E3b-6a%5E3b%2B9a%5E2b%2B9a%5E2b%2B36a%5E2b%5E2-54ab%5E2-54ab%5E2%2B81b%5E2

a%5E4-12a%5E3b%2B18a%5E2b%2B36a%5E2b%5E2-108ab%5E2%2B81b%5E2