3. For the function f(x) = 2x* – 5x³ + 9x² + x – 15: %3D State the degree of the polynomial State the number of zeros the polynomial function will have. C. Use the Rational Zero Theorem to find all of the possible rational zeros

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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3. For the function \( f(x) = 2x^4 - 5x^3 + 9x^2 + x - 15 \):

a. State the **degree** of the polynomial  
   ____________________

b. State the **number** of zeros the polynomial function will have.  
   ____________________

c. Use the **Rational Zero Theorem** to find all of the **possible rational zeros**  
   __________________________________________________________

d. Look at the graph or table on a graphing calculator to determine which numbers on the list of rational zeros are **real zeros** indicated by the x-intercepts of the graph.  
   ____________________

e. In the space below, use **synthetic division** to verify **one** rational zero.  
   Note: If the division remainder is zero, the number divided is a zero of the function.  
   ____________________________________________________________

f. **Find all remaining zeros.** *(Show work!)*

   **Note:** Use the **reduced** polynomial (the quotient from the division) to continue the search for zeros  
   ☺ If the degree of the reduced polynomial is **higher than 2**, continue the synthetic division process with another real zero. *(Remember: a number may be a multiple zero – i.e., occur more than once)*  
   ☺ Whenever the reduced polynomial is **quadratic**, the zeros can be found by using methods for solving quadratic equations.

g. List **all** of the zeros of the polynomial function  
   ____________________________________________________________

h. Write the polynomial **function** as a product of linear factors.  
   ____________________________________________________________
Transcribed Image Text:3. For the function \( f(x) = 2x^4 - 5x^3 + 9x^2 + x - 15 \): a. State the **degree** of the polynomial ____________________ b. State the **number** of zeros the polynomial function will have. ____________________ c. Use the **Rational Zero Theorem** to find all of the **possible rational zeros** __________________________________________________________ d. Look at the graph or table on a graphing calculator to determine which numbers on the list of rational zeros are **real zeros** indicated by the x-intercepts of the graph. ____________________ e. In the space below, use **synthetic division** to verify **one** rational zero. Note: If the division remainder is zero, the number divided is a zero of the function. ____________________________________________________________ f. **Find all remaining zeros.** *(Show work!)* **Note:** Use the **reduced** polynomial (the quotient from the division) to continue the search for zeros ☺ If the degree of the reduced polynomial is **higher than 2**, continue the synthetic division process with another real zero. *(Remember: a number may be a multiple zero – i.e., occur more than once)* ☺ Whenever the reduced polynomial is **quadratic**, the zeros can be found by using methods for solving quadratic equations. g. List **all** of the zeros of the polynomial function ____________________________________________________________ h. Write the polynomial **function** as a product of linear factors. ____________________________________________________________
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