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Even and Odd Functions and Zeros of Functions In Exercises \(79-82\) , determine whether the function is even, odd, or neither. Then find the zeros of the function. Use a graphing utility to verify your result. $$ f(x)=x^{2}\left(4-x^{2}\right) $$

Short Answer

Expert verified
The function \(f(x)=x^{2}(4-x^{2})\) is an even function. The zeros of the function are \(x=0\) and \(x= \pm 2\).

Step by step solution

01

Identifying if the Function is Even, Odd, or Neither

Start by determining if the function is even or odd. Substitute -x for x in the function. If \(f(-x) = f(x)\), then the function is even. If \(f(-x) = -f(x)\), then the function is odd. If the function is neither even or odd, it will not fulfill either of the two conditions. For \(f(x)=x^{2}(4-x^{2})\), we get \(f(-x)=(-x)^{2}(4-(-x)^{2}) =x^{2}(4-x^{2}) = f(x)\), so the function is even.
02

Find the Zeros of the Function

To find the zeros of the function, set the given function equal to zero and solve for x. \(x^{2}(4-x^{2})=0\). This breaks down to the solution \(x=0\) and \(x= \pm 2\).
03

Verification Using a Graphing Utility

Use a graphing utility to verify the results. For the given function \(f(x)=x^{2}(4-x^{2})\), plotting the graph should show that the function is symmetric about the y-axis proving it to be an even function and it should intersect the x-axis at the points \(x=0\) and \(x=2\) and \(x=-2\), which are the zeros of the function.

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Key Concepts

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

Zeros of Functions
Understanding the zeros of a function is fundamental in the realm of algebra. These zeros are the values of 'x' for which the function output 'f(x)' becomes zero. In simpler terms, they are the points where the graph of the function crosses or touches the x-axis. For instance, in the exercise given where the function is defined as f(x)=x^2(4-x^2), determining the zeros means solving the equation f(x) = 0.

By setting x^2(4-x^2) = 0, we apply the Zero Product Property, which states that if a product of factors equals zero, at least one of the factors must be zero. Based on this property, we deduce the solutions x=0, x=2, and x=-2. Each of these solutions is a point where the graph intersects the x-axis, and thus, they are the zeros of the function in question.

Understanding how to efficiently find the zeros of functions is crucial not only in solving textbook exercises but also in various applications like physics for calculating equilibrium points, in economics to determine break-even points, and in mathematics to factor and solve polynomials.
Graphing Utility
With advancements in technology, graphing utilities have become an exceptional tool for students to visualize mathematical concepts. A graphing utility is a software or calculator that allows you to plot equations and analyze graphs. It serves as an excellent means to verify solutions through visualization.

In relation to the exercise at hand, a graphing utility helps to verify the symmetry and the zeros of the function f(x)=x^2(4-x^2). By plotting the function, we can easily see whether the graph is symmetric about the y-axis, which would confirm the function's even nature. Additionally, the points where the graph crosses the x-axis help to confirm the zeros that we have calculated algebraically. The graphing utility simplifies the complex process of drawing and understanding graphs, especially when dealing with non-linear equations such as quadratics, cubics, and beyond.
Symmetry of Functions
The concept of symmetry in functions pertains to their graphical representation. If a function's graph is identical on both sides of the y-axis, it is said to be even; it corresponds to the mathematical condition f(-x) = f(x). Odd functions, on the other hand, exhibit rotational symmetry about the origin, fulfilling the relation f(-x) = -f(x). Functions that do not comply with these conditions are neither even nor odd.

In our exercise, we determine if f(x)=x^2(4-x^2) is even, odd, or neither by substituting -x for x. The resulting equality f(-x) = f(x) indicates the function is even. This symmetry in functions not only influences their graph but also impacts their integrals, series expansions, and behaviors under various transformations. This deepens our comprehension of functions' properties and assists in solving integrals and differential equations where symmetry can simplify calculations.

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Most popular questions from this chapter

Falling Object In an experiment, students measured the speed \(s\) (in meters per second) of a falling object \(t\) seconds after it was released. The results are shown in the table. $$ \begin{array}{|c|c|c|c|c|c|}\hline t & {0} & {1} & {2} & {3} & {4} \\ \hline s & {0} & {11.0} & {19.4} & {29.2} & {39.4} \\ \hline\end{array} $$ (a) Use the regression capabilities of a graphing utility to find a linear model for the data. (b) Use a graphing utility to plot the data and graph the model. How well does the model fit the data? Explain. (c) Use the model to estimate the speed of the object after 2.5 seconds.

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