CPM Homework Help : CCA2 Problem 12-59

Expand.

$(a + b)^4$
Hint (a):
Use the binomial theorem.
Answer (a):
$a^4+4a^3b+6a^2b^2+4ab^3+b^4$

$(3m - 2)^4$
Hint (b):
Use the results of part (a). Let $a = 3m$ and $b = -2$ . Simplify.
Answer (b):
$81m^4 -216m^3 +216m^2 -96m+16$