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Warm Up
no
0, 3
x = -3
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Homework Questions
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Section 2.2 Synthetic Division; The Remainder and Factor
TheoremsObjective: To use synthetic division
and to apply the remainder and factor theorems.
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Vocabulary
RemainderQuotient DivisorDividend RemainderQuotientDivisorDividend
35423
35423
When 23 is divided by 4, the quotient is 5 and the remainder is 3.
4 is not a factor of 23, because if when 23 is divided by 4 the remainder is not zero.
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The Remainder Theorem
When a polynomial P(x) is divided by x – a, the remainder is P(a)
)()( axxP Remainder =P(a)
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2-2 Synthetic Division; The Remainder and Factor THMs
4 2Divide 2 15 10 5 by 3x x x x
3 2 0 -15 -10 5
266
183
91
32
4 23 22 15 10 5 2
2 6 3 13 3
x x xx x x
x x
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Example 1
Divide P(x) = x3+ 5x2 + 5x – 2, by x + 2
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The Factor Theorem
if and only if
⇔
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Example 4
If P(x) = 2x4 + 5x3 – 8x2 – 17x – 6, determine whether each of the following is a factor of P(x):
A) x – 1
B) x – 2
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Example 3
If x = -1 is a root, find all others roots for
p(x)= x3+ 3x2 + x – 1
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Classwork
Class ExercisesPage 60 #1-5
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Homework
Section 2.2
Page 61 #1-25 odds
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√7+√14−15√7
−14 √7+√14
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3 𝑖√21−2 𝑖√21−√21(−1−𝑖)√21
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8 𝑥 √3+2𝑥 √9−31𝑥 √3
6 𝑥−23𝑥 √3
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√31𝑥2+2 𝑥√31+5√31 𝑖
(3 𝑥−5)√31
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√8+4 √2−6√50
−24 √2
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−2√3−√27+3 √27
4√3
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6+3√6
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6 √5+15√2
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−10+√2
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4√72𝑎4𝑏4
24 𝑎2𝑏2 √2