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Graph \(f,\) estimate all real zeros, and determine the multiplicity of each zero. $$f(x)=x^{5}-\frac{1}{4} x^{4}-\frac{19}{8} x^{3}-\frac{9}{32} x^{2}+\frac{405}{256} x+\frac{675}{1024}$$

Short Answer

Expert verified
Graph to find zeros, observe behavior at each zero for multiplicity.

Step by step solution

01

Understanding the Problem

We need to graph the polynomial function \(f(x) = x^{5} - \frac{1}{4} x^{4} - \frac{19}{8} x^{3} - \frac{9}{32} x^{2} + \frac{405}{256} x + \frac{675}{1024}\). By analyzing this graph, we'll estimate the real roots (zeros) of \(f(x)\) and also determine their multiplicities.
02

Graphing the Polynomial Function

Use graphing software or a graphing calculator to accurately plot \(f(x)\). The graph of \(f(x)\) should display the shape and provide intersection points with the x-axis, which represent real zeros.
03

Estimating Real Zeros from the Graph

After graphing \(f(x)\), visually inspect where the graph crosses or touches the x-axis. These locations are the real zeros of the function. Ensure to note the approximate x-values of these intersections.
04

Determining Multiplicity of Each Zero

Check the behavior of the graph at each zero. If the graph crosses the x-axis, the zero typically has an odd multiplicity. If it touches and turns back at the x-axis, the zero typically has an even multiplicity.
05

Listing the Zeros and Their Multiplicities

Compile a list of the zeros based on your findings from the graph and assign an estimated multiplicity to each zero, supported by how the graph behaves at those points.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Graphing Polynomials
Polynomials are fascinating and graphing them helps in visualizing their behavior. When you graph a polynomial, you're essentially plotting a curve that represents the function in all its variations over different values of the variable. The graph of a polynomial like the one given can have several characteristics:

1. **End Behavior:** The degree of the polynomial tells us how the function behaves as the variable "x" goes to positive or negative infinity. For the function \( f(x) = x^5 - \frac{1}{4}x^4 - \frac{19}{8}x^3 - \frac{9}{32}x^2 + \frac{405}{256}x + \frac{675}{1024} \), the highest degree term is \( x^5 \). This indicates that as \( x \rightarrow \infty \), \( f(x) \rightarrow \infty \) and as \( x \rightarrow -\infty \), \( f(x) \rightarrow -\infty \).

2. **Turning Points:** A polynomial of degree \( n \) can have up to \( n - 1 \) turning points. Thus, the fifth-degree polynomial here can have up to 4 turning points.

By using a graphing tool, you can plot these points and observe how the curve twists and turns. The intersections with the x-axis will guide us to the zeros of the function as each intersection indicates where the function's value is zero.
Zeros of Functions
Zeros of a function, sometimes called roots or solutions, are the values of "x" that make the function equal to zero. On a graph, these are the points where the curve crosses or touches the x-axis.

To find the zeros of the function \( f(x) = x^5 - \frac{1}{4}x^4 - \frac{19}{8}x^3 - \frac{9}{32}x^2 + \frac{405}{256}x + \frac{675}{1024} \), you need to look closely at the graph:

- **Identify Intersection Points:** These are the points where the curve crosses or touches the x-axis.
- **Approximation**: Since exact calculation isn't possible just by looking, we often estimate these zeros when graphing manually. The software might offer numerical solutions for more exact roots.

Having plotted the polynomial, record these intersection points and write them as approximate values. Knowing where these zeros lie helps further in analyzing the behavior of the function.
Multiplicity of Zeros
Understanding the multiplicity of zeros gives us insight into how a polynomial function behaves at its roots. The multiplicity of a zero refers to the number of times a particular zero is repeated in the polynomial.

- **Odd Multiplicity:** When a graph crosses the x-axis at a point, the zero has an odd multiplicity, meaning the function value changes sign.

- **Even Multiplicity:** When the graph merely touches the x-axis and turns back, the zero has an even multiplicity, which indicates the function value does not change sign.

To determine multiplicity for each zero in the polynomial \( f(x) = x^5 - \frac{1}{4}x^4 - \frac{19}{8}x^3 - \frac{9}{32}x^2 + \frac{405}{256}x + \frac{675}{1024} \), observe each point where the graph intersects or touches the x-axis:

- **Note the Nature of Intersection:** Seeing whether the curve crosses or simply touches helps you assign the correct multiplicity.
- **Inference from Graph's Shape:** The graph's behavior not only indicates zeros but also their multiplicity, which is critical for understanding the nuanced behavior of polynomial functions throughout their ranges.

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Most popular questions from this chapter

When uranium disintegrates into lead, one step in the process is the radioactive decay of radium into radon gas. Radon enters through the soil into home basements, where it presents a health hazard if inhaled. In the simplest case of radon detection, a sample of air with volume \(V\) is taken. After equilibrium has been established, the radioactive decay \(D\) of the radon gas is counted with efficiency \(E\) over time \(t .\) The radon concentration \(C\) present in the sample of air varies directly as the product of \(D\) and \(E\) and inversely as the product of \(V\) and \(t\) For a fixed radon concentration \(C\) and time \(t,\) find the change in the radioactive decay count \(D\) if \(V\) is doubled and \(E\) is reduced by \(20 \%\)

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