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WEEK FIVE
TOPIC: BINOMIAL EXPANSION 1
SUB-TOPICS:
SUB-TOPIC ONE
The Pascal’s triangle is a format for getting the coefficients of expansions. It applies to binomial and binomial formed from a reduced polynomial.
Consider the expansion of each of the following:
(a+b)0
(a+b)1
(a+b)2
(a+b)3
(a+b)4
(a+b)5
By ordinary expansion of algebraic terms, we have:
(a+b)0 = 1
(a+b)1 = 1a + 1b
(a+b)2 = 1a2+2ab+1b2
(a+b)3 = 1a3+3a2b+3ab2+1b3
(a+b)4 = 1a4+4a3b+6a2b2+4ab3+1b4
(a+b)5 = 1a5+5a4b+10a3b2+10a2b3+5ab4+1b5
Consider the array of coefficients of a and b. We can display it as follows:
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