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Chapter 4 (Lesson 2).notebook October 23, 2017
Chapter 4Lesson 2 (Powers of Binomials)
Chapter 4Lesson 2 (Powers of Binomials)
What do these three things have in common?
STRING NAVY GREEN
Chapter 4 (Lesson 2).notebook October 23, 2017
Chapter 4Lesson 2 (Powers of Binomials)
Pascal’s Triangle Pascal’s triangle is the pattern of coefficients of powers of binomials displayed in triangular form. Each row begins and ends with 1 and each coefficient is the sum of the two coefficients above it in the previous row.
Example 1
Expand (x + y)6
Notice that the sum of each row is 2n power!!!
Chapter 4Lesson 2 (Powers of Binomials)
Recall from probability, the counting strategy of Permutations and Combinations, most specifically,
COMBINATIONS:
Chapter 4 (Lesson 2).notebook October 23, 2017Chapter 4
Lesson 2 (Powers of Binomials)
Expand (x + 2)4
= 4C0x420 + 4C1x321 + 4C2x222 + 4C3x123 + 4C4x024
=(1)(x4)(1) + (4)(x3)(3) + (6)(x2)(4) + (4)(x)(8) + (1)(1)(16)
= x4 + 8x3 + 24x2 + 32x + 16
Chapter 4Lesson 2 (Powers of Binomials)
Example 2
Expand (3x y)5
Chapter 4 (Lesson 2).notebook October 23, 2017
Chapter 4Lesson 2 (Powers of Binomials)
Example 3
Find the sixth term of (c + d)10
Example 4
Find the fourth term of (a + 3b)9
Chapter 4Lesson 2 (Powers of Binomials)
Chapter 4 (Lesson 2).notebook October 23, 2017Chapter 4
Lesson 2 (Powers of Binomials)
Example 5
If a baseball pitcher is just as likely to throw a ball as he/she is a strike, find the probability that 11 of his first 12 pitches are
strikes.
Solution:
Remember that Probability = Desired outcomes total outcomes
Step 1: Find total outcomes. Since there are 2 outcomes for each pitch (ball or strike), the total outcomes would be 212 = 4096
Step 2: Find the desired outcome. 11 of 12 strikes would be the coefficient of the term in the binomial expansion of the 11th term.
12C11B1211S11 = 12BS11. So the coefficient is 12
Step 3: The probability would be 12/4096
Assignment
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