Binomial Theorem
A binomial expression has 2 terms
e.g. 4 + 2x
Sometimes we need to expand binomial expressions like
(x + 2)2, (2x - 3 )4 etc
Example 1
(1 + x)2 = (1 + x)(1 + x) = 1 + 2x + x2
Example 2
(1 + x)3 = (1 + x)(1 + 2x + x2) = 1 + 3x + 3x2 + x3
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