Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 1 - 1.1 - Graphs of Equations - 1.1 Exercises - Page 79: 41

Answer

There is no symmetry about the x-axis, y-axis and the origin. See graph The intercepts: $(-\sqrt[3]{3},0)$, $(0,3)$.

Work Step by Step

$$y=x^3+3$$ Testing for y-symmetry: $$y=(-x)^3+3$$ $$y=-x^3+2x$$ Since the resulting equation is not the same as the original equation, there is no y-symmetry. Testing for x-symmetry: $$-y=x^3+3$$ $$y=-x^3-3$$ Since the resulting equation is not the same as the original equation, there is no x-symmetry. Testing for origin-symmetry: $$-y=(-x)^3+3$$ $$-y=-x^3+3$$ $$y=x^3-3$$ Since the resulting equation is not the same as the original equation, there is no origin-symmetry. Finding the x-intercepts where $y=0$: $$0=x^3+3$$ $$x^3=-3$$ $$x=\sqrt[3]{-3}$$ $$x=-\sqrt[3]{3}$$ Thus, the x-intercept is $(-\sqrt[3]{3},0)$. Finding the y-intercept where $x=0$: $$y=0^3+3$$ $$y=3$$ Thus, the y-intercept is $(0,3)$. Finding another point by taking $x=-2$: $$y=(-2)^3+3=-5$$ Thus, another point is at $(-2,-5)$. Using the points, the graph is as shown. The intercepts are for x-intercept is $(-\sqrt[3]{3},0)$ and for y-intercept is $(0,3)$.
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