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Warm Up. Find all zeros. Graph. 3 22 7 4x x x
Warm Up. Find all zeros. Graph. 3 22 7 4x x x
4,2,1: FactorsPossible
1 4721 431
0431 141
431 2
xxx
xxx
41 xx
Touches Through
More on Rational Root Theorem
Fundamental Theorem of Algebra
In the complex number system, an nth degree polynomial has precisely “n” zeros.
Find all zeros. 2 6x x
023 xx
23 xx
Goes through both!
Find all zeros. 2 4 4x x
Find all zeros. 2 4 4x x
022 xx
2xMultiplicity of 2.Just Touches.
Find all zeros. 3 4x x
Find all zeros. 3 4x x
042 xx
0x
ix
x
x
2
4
042
2
Find all zeros. 4 16x
Find all zeros. 4 16x
0422
0442
22
xxx
xx
ixixxx 2222
Find all zeros. 3 23 4 12x x x
Find all zeros. 3 23 4 12x x x
34
3432
2
xx
xxx
322 xixix
Find all zeros. 3 24 4 4x x x
Find all zeros. 3 24 4 4x x x
4,2,1: FactorsPossible
Using the remainder theorem wesee that there are NO real solutions!
Find all zeros. 4 36 5 1x x
Find all zeros. 4 36 5 1x x
6
1,3
1,2
1,1
6,3,2,1
1:
FactorsPossible
Synthetic division gets you to the following:
2262
11 2
xxxx
Now use the Quadratic Formulafor this part.
1x
2
1x
0132 2 xx
6
111
6
111
32
13411
ix
x
x
Find all zeros. 5 3 22 12 8x x x x
Find all zeros. 5 3 22 12 8x x x x
8,4,2,1: FactorsPossible
Synthetic Division gives
04211 2 xxxx
ixixxx 2221
Multiplicity of 2
Find all zeros. 4 36 27 20x x x
Find all zeros. 4 36 27 20x x x
20,10,5,4,2,1: FactorsPossible
Synthetic Division gives
5341 2 xxxx
Quadratic Formula completes it.
2
29341
xxx
Complex Conjugates
Complex Zeros
Always come in conjugate pairs
i
i
23
23
i
i
i
i
3
3
Write a polynomial with the given zeros: 2, i, -i
ixixx 2
22
22
12
2
2
23
23
2
22
xxx
xxx
xx
ixx
ixixx
Write a polynomial with the given zeros: 3, 4i
ixixx 443 Remember – they come in pairs!
48163
163
163
443
23
2
22
xxx
xx
ixx
ixixx
Write a polynomial with the given zeros: 4, 2-3i
ixixx 32324
52298
52164134
1344
963642324
32324
23
223
2
22
xxx
xxxxx
xxx
iixiixxixxx
ixixx
Find all zeros, given that (2i) is a root.
4 3 2( ) 2 8 12f x x x x x
i2 128121 1286442 iii
1 i22 34 i i6 0i2i2 i4 i6
1 2 3 013
0322
xx
xx
1322 xxixix
Find all zeros, given that (3 – 5i) is a solution.
3 2( ) 7 40 34f x x x x
Find all zeros, given that (3 – 5i) is a solution.
3 2( ) 7 40 34f x x x x