College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 2 - Section 2.2 - Graphs of Equations in Two Variables; Intercepts; Symmetry - 2.2 Assess Your Understanding - Page 166: 83

Answer

The x-intercepts are (0,0) and (2,0) The y-intercept are (0,-1), (0,0), and (0,1) The equation has symmetry only with respect to the x-axis.

Work Step by Step

To find the x-intercept(s), we set y to 0 and solve for x: $(x^2+0^2-x)^2=x^2+0^2$ $(x^2-x)^2=x^2$ $\sqrt{(x^2-x)^2}=\sqrt{x^2}$ $x^2-x=x$ $x^2-2x=0$ $x(x-2)=0$ $x_1=0$ $x_2-2=0\rightarrow x_2=2$ To find the y-intercept(s), we set x to 0 and solve for y: $(0^2+y^2-0)^2=0^2+y^2$ $(y^2)^2=y^2$ $y^4-y^2=0$ $y^2(y^2-1)=0$ Two options: $y_1^2=0\rightarrow y_1=0$ And: $y^2-1=0$ $y^2=1$ $\sqrt{y^2}=\sqrt{1}$ $y=\pm1$ To test for symmetry with respect to the x-axis, we substitute y for -y and check if it equals the original equation: $(x^2+(-y)^2-x)^2=x^2+(-y)^2$ $(x^2+y^2-x)^2=x^2+y^2 \checkmark$ To test for symmetry with respect to the y-axis, we substitute x for -x and check if it equals the original equation: $((-x)^2+y^2-(-x))^2=(-x)^2+y^2$ $(x^2+y^2+x)^2=x^2+y^2$ nope To test for symmetry with respect to the origin, we substitute x for -x, substitute y for -y and check if it equals the original equation: $((-x)^2+(-y)^2-(-x))^2=(-x)^2+(-y)^2$ $(x^2+y^2+x)^2=x^2+y^2$ nope
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