Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Chapter F - Foundations: A Prelude to Functions - Section F.2 Graphs of Equations in Two Variables; Intercepts; Symmetry - F.2 Assess Your Understanding - Page 16: 26

Answer

The $x$-intercepts are $1$ and $-1$ The y-intercept is $4$ See the graph below.

Work Step by Step

In order to find the $x$-intercept, we have to plug $y=0$ into the equation and solve for $x$,. $4x^2+y=4$ $4x^2+0=4$ $4x^2=4$ $x^2=1$ $x=\pm1$ The same thing should be done for the $y$-intercept, however, here $x=0$ should be plugged into the equation then solve for $y$. $4x^2+y=4$ $4(0)^2+y=4$ $y=4$ There are two $x$-intercepts: $1$ and $-1$ The $y$-intercept is $4$ Few other points that will help us plot the graph: If $x=-2$ $4(-2)^2+y=4$ $y=-12$ The point $(-2,-12)$ is on the graph. If $x=2$ $4(2)^2+y=4$ $y=-12$ The point $(2,-12)$ is on the graph. Plot the points and connect them using a smooth curve to complete the graph. Refer to the graph above.
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