Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Appendix D - Graphing Techniques - Exercises - Page 447: 37

Answer

For $y = -4x^3 + x$, it has a graph that is symmetric with respect to the origin.

Work Step by Step

In $y = -4x^3 + x$, a) To test for symmetry w.r.t the $x$-axis replace $y$ with $-y$, we have $(-y) = -4x^3 + x$ $-y = -4x^3 + x$ $y = 4x^3 - x$ which the result is not the same as the original equation, therefore, it is not symmetric with respect to the $x$-axis b) To test for symmetry w.r.t the $y$-axis replace $x$ with $-x$, we have $y = -4(-x)^3 + (-x)$ $y = 4x^3 - x$ which the result is not the same as the original equation, therefore, it is not symmetric with respect to the $y$-axis c) To test for symmetry w.r.t the origin replace $x$ with $-x$ and $y$ with $-y$, we have $(-y) = -4(-x)^3 + (-x)$ $-y = 4x^3 - x$ $y = -4x^3 + x$ which the result is the same as the original equation, therefore, it is symmetric with respect to the origin
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