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Determine whether the graphs of the following equations and fimctions are symmetric about the \(x\)-axis, the \(y\) -axis, or the origin. Check your work by graphing. $$x^{3}-y^{5}=0$$

Short Answer

Expert verified
Answer: The graph of the given equation is symmetric about the x-axis and the origin.

Step by step solution

01

Check symmetry about the x-axis

To check for symmetry about the x-axis, replace y with -y in the given equation and see if the resulting equation is still true: $$(x^{3}) - (-y)^{5} = 0$$ Since \((-y)^5 = -y^5\), we get $$(x^{3}) - y^{5} = 0$$ The resulting equation is identical to the original equation, so the graph of the equation is symmetric about the x-axis.
02

Check symmetry about the y-axis

To check for symmetry about the y-axis, replace x with -x in the given equation and see if the resulting equation is still true: $$(-x^{3}) -y^{5} = 0$$ Since \((-x)^3 = -x^3\), we get $$-x^{3} - y^{5} = 0$$ The resulting equation is not identical to the original equation, so the graph of the equation is not symmetric about the y-axis.
03

Check symmetry about the origin

To check for symmetry about the origin, replace x with -x and y with -y in the given equation and see if the resulting equation is still true: $$(-x^{3}) - (-y)^{5} = 0$$ Since \((-x)^3 = -x^3\) and \((-y)^5 = -y^5\), we get $$-x^{3} - y^{5} = 0$$ The resulting equation is not identical to the original equation, but it does resemble the opposite of the original equation. So, the graph of the equation is symmetric about the origin. Therefore, the graph of the given equation is symmetric about the \(x\)-axis and the origin.

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Key Concepts

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

Symmetry about the x-axis
Understanding symmetry in regards to the x-axis is pivotal for graphical analysis. To determine if a graph exhibits this type of symmetry, we simply replace every occurrence of 'y' in the equation with '-y'. If the equation remains the same after this substitution, the graph is said to be symmetric about the x-axis.

What does it mean visually? Imagine folding the graph along the x-axis; if the two halves align perfectly, that's x-axis symmetry.

In our example, replacing 'y' with '-y' in the equation \(x^{3}-y^{5}=0\) leads us back to the initial equation, thus proving that it is symmetric about the x-axis. This quality can be particularly useful when sketching graphs or predicting their behavior.
Symmetry about the y-axis
Symmetry about the y-axis can be tested by substituting 'x' with '-x' in the equation. If the new equation holds true to the original, then the graph possesses y-axis symmetry. This phenomenon can be visualized as mirroring the graph over the y-axis.

However, in our case, using \(x^{3}-y^{5}=0\) and replacing 'x' with '-x', we derive \( -x^{3} - y^{5} = 0\), which is not identical to the original equation. Therefore, the graph does not have symmetry about the y-axis. Recognizing this helps avoid incorrect assumptions about a graph's shape and informs our graphing techniques.
Symmetry about the origin
To check for origin symmetry, both 'x' and 'y' are replaced by '-x' and '-y', respectively. If the equation transforms to the negative of the original or remains unchanged, the graph is origin-symmetric. Envision flipping the graph across both the x-axis and y-axis; if it looks the same, it has origin symmetry.

Applying these changes to our example equation \(x^{3}-y^{5}=0\), we get \( -x^{3} - y^{5} = 0\), which is the negative of the original equation. As a result, the graph is symmetrical about the origin. Origin symmetry usually implies that the graph is also symmetric about both axes individually, but there are exceptions, as seen in our example.
Graphing Techniques
Graphing techniques are essential tools for visualizing and understanding mathematical relationships. When graphing, there are a few key steps we can follow:
  • Plotting points that satisfy the equation
  • Checking for and applying symmetry
  • Identifying key features such as intercepts and asymptotes

Using symmetry tests, as we did for the x-axis and origin, simplifies graphing and ensures accuracy. It is also important to note features like curvature and where the graph lies in relation to the axes.

Advanced graphing can incorporate calculators or software for a more accurate depiction, especially for complex functions like our cubic equation \(x^{3}-y^{5}=0\).
Algebraic Manipulation
Algebraic manipulation involves the strategic modification of equations to better understand their properties or solve for variables. This can include expanding, factoring, simplifying, and, as in our example, substituting variables to check for symmetry.

Through algebraic manipulation, we can also isolate terms to make graphing easier or to solve for one variable in terms of another. It's the algebraic manipulation that allowed us to discover the symmetries about the x-axis and the origin for the equation \(x^{3}-y^{5}=0\). Mastering these techniques empowers students to tackle a wide range of mathematical challenges efficiently.

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Most popular questions from this chapter

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