Finding Zeros 1. long division 2. synthetic division 3. factor/remainder theorem 4. Test ±(p/q)
The Rational Zero Theorem: f(x) = a0xn + a1xn1......+an
, where p are the factors of the constant term and q are the factors of the leading coefficient
The Rational Zero Theorem: f(x) = a0xn + a1xn1......+an For a function f(x) with integer coefficients. Possible Rational Zeros can be written in the form :
, where p are the factors of the constant term and q are the factors of the leading coefficient p= an
q= a0
1
dRational Zero Theorem Day 1 completed.notebook
December 14, 2015
Multiplicity: when the same answer appears 2 or more times. Even multiplicities imply the graph kisses the x axis and odd multiplicities imply the graph goes through the xaxis to the other side. Ex:
Ex:
Ex1. List the possible rational zeros. a) f(x) = 2x3 + 3x2 8x + 3
b) f(x) = 6x3 + 6x2 15x 2
2
dRational Zero Theorem Day 1 completed.notebook
December 14, 2015
Ex2. List all possible, rational zeros, state the roots and their multiplicity if applicable: x3 5x2 22x + 56
Ex3. f(x) = 2x4 + 13x3 + 29x2 + 27x + 9 a) List all the rational zeros.
b) Given that x = 1 is a repeated root, find the other two zeros.
3
dRational Zero Theorem Day 1 completed.notebook
December 14, 2015
Ex4. List all possible, rational roots, find all the real zeros and state their multiplicity if applicable: f(x)=10x3 15x2 16x +12
Ex 5: List all possible, rational zeros, find all solutions and their multiplicity if applicable: x3 + 2x2 2x 4=0
4
dRational Zero Theorem Day 1 completed.notebook
December 14, 2015
Ex: Verify that (x+2)(x1) are factors of f(x)=2x3 +x2 5x +2. Find remaining factors and zeros and write factored form.
(skip section D). (skip section E). 3) Is your project a remix or brand new? (If remix, add URL of original). 4) Describe in three to five sentences what your project.
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