Section 3.4 Zeros of Polynomial Functions. The Rational Zero Theorem.

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Presentation transcript:

Section 3.4 Zeros of Polynomial Functions

The Rational Zero Theorem

Example List all possible rational zeros of f(x)=x 3 -3x 2 -4x+12 Find one of the zeros of the function using synthetic division, then factor the remaining polynomial. What are all of the zeros of the function? How can the graph below help you find the zeros?

Example List all possible rational zeros of f(x)=6x 3 -19x 2 +2x+3 Starting with the integers, find one zero of the function using synthetic division, then factor the remaining polynomial. What are all of the zeros of the function?

Example List all possible rational roots of x 4 -x 3 +7x 2 - 9x-18=0 Starting with the integers, find two roots of the equation using synthetic division. The graph below will help you easily find those roots. Factor the remaining polynomial. What are all of the roots of the equation? The graph below will NOT help you find the imaginary roots. Why?

The Fundamental Theorem of Algebra

The Linear Factorization Theorem

Example Find a fourth-degree polynomial function f(x) with real coefficients that has -1,2 and i as zeros and such that f(1)=- 4

Descartes’s Rule of Signs

Example For f(x)=x 3 - 3x 2 - x+3 how many positive and negative zeros are there? What are the zeros of the function?

Example For f(x)=x 3 - x 2 +4x- 4 how many positive and negative zeros are there? Use a graphing utility to find one real zero of the function. What are all the zeros of the function?

(a) (b) (c) (d) List all possible rational zeros of the function f(x)=x 3 +3x 2 - 6x-8.

(a) (b) (c) (d) Find a third-degree polynomial function f(x) with real coefficients that have 1 and 2i as zeros and such that f(1)=0.

(a) (b) (c) (d) What are the zeros of the function f(x)=x 3 +2x 2 +8x+16? Find the first zero using a graphing utility.