In the tree:
A
/ \
B C <-- Difference = 2
/ /
D E
/
G
What are the two subtrees for node C that make it unbalanced??
Let's solve some homework Leslie...
The C tree has two subtrees. One of them isn't pictured...
C
/ \
E
/
G
Calculate the height of each subtree. Height 2 vs Height 0...