2
14.3 The Binomial Theorem 1 Write your questions and thoughts here! The Binomial Theorem Expansion, the boring and tedious way: The AMAZING Binomial Theorem: ! + ! ! = ! ! ! !!! ! ! ! !!! where ! ! is said “n choose k” and represents the number of ways to select k things from n. where ! ! = n C k = !! !! !!! ! and n!= n(n – 1)(n – 2)…(2)1 EXAMPLES: Evaluate: ! ! ! ! ! ! Binomial Expansion, using the amazing Binomial Theorem: ! + ! ! = ! ! ! !!! ! ! ! !!! (a + b) 3 (2x – 3y) 3 You try! Expand completely. (5x + 3y) 4 ! + ! ! = ! + ! ! = ! + ! ! = ! + ! ! = ! + ! ! = ! + ! ! =

14.3%The%Binomial%Theorem%% - PreCalculussmacmathprecalculus.weebly.com/.../pc_unit_14.3_n_key.pdf · 2019-07-31 · 14.3%The%Binomial%Theorem%% 2 Write your questions and thoughts

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Page 1: 14.3%The%Binomial%Theorem%% - PreCalculussmacmathprecalculus.weebly.com/.../pc_unit_14.3_n_key.pdf · 2019-07-31 · 14.3%The%Binomial%Theorem%% 2 Write your questions and thoughts

14.3%The%Binomial%Theorem%% 1Write your questions and thoughts here!

The%Binomial%Theorem%

Expansion,%the%boring%and%tedious%way:%

The%AMAZING%Binomial%Theorem:%

! + ! ! = !! !!!!!!

!

!!!!

where! !! !is!said!“n!choose!k”!and!represents!the!number!of!ways!to!select!k!things!from!n.%

where! !! =!nCk!= ! !!!! !!! ! and! !n!!=!n(n!–!1)(n!–!2)…(2)1!

EXAMPLES:!

Evaluate:!!!

!!

!!

Binomial%Expansion,%using%the%amazing%Binomial%Theorem:%%%%% ! + ! ! = !! !!!!!!

!

!!!!

(a!+!b)3

(2x!–!3y)3

You%try!%Expand%completely.%

(5x!+!3y)4!

!+ ! !!!!=%!+ ! !!!!=%!+ ! !!!!=%!+ ! !!!!=%!+ ! !!!!=%!+ ! !!!!=%

Page 2: 14.3%The%Binomial%Theorem%% - PreCalculussmacmathprecalculus.weebly.com/.../pc_unit_14.3_n_key.pdf · 2019-07-31 · 14.3%The%Binomial%Theorem%% 2 Write your questions and thoughts

14.3%The%Binomial%Theorem%% 2Write your questions and thoughts here!

EXAMPLES:%

Find%each%term%described.%

1. The!third!term!in!the!expansion!(y!+!5)4 2. The!third!term!in!the!expansion!(2x!K!3)6

Expand%completely.%

3. (2!+!3y)4

Pascal’s%Triangle%

!+ ! !!!!=%!+ ! !!!!=%!+ ! !!!!=%!+ ! !!!!=%!+ ! !!!!=%!+ ! !!!!=%

⋮%

!%!!+ !!%

!!! + !!"+ !!!%!!! + !!!!+ !!!! + !!!%

!!! + !!!!+ !!!!! + !!"! + !!!%!!! + !!!!+ !"!!!! + !"!!!! + !!"! + !!!%

⋮%

Looking%at%just%the%

coefficients:%

!%!!!!!!!!%

!!!!!!!!!!!!!%!!!!!!!!!!!!!!!!!!!!!%

!!!!!!!!!!!!!!!!!!!!!!!!!!!%!!!!!!!!!!!!!"!!!!!"!!!!!!!!!!!%

⋮%

Which%happens%to%be%the%same%

as:%

0C01C0%%%%1C1

2C0%%%%%%2C1%%%%%2C2%3C0%%%%%%3C1%%%%%3C2%%%%%%%%3C3%

4C0%%%%%%4C1%%%%%4C2%%%%%%%%4C3%%%%%%%4C4%5C0%%%%%%5C1%%%%%5C2%%%%%%%%5C3%%%%%%%5C4%%%%%%5C5%

⋮%


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