## College Algebra (10th Edition)

$4$
RECALL: The graph of an equation that is symmetric with respect to the y-axis has the following property: If the point $(a, b)$ is on the graph of the equation, the point $(-a, b)$ is also on the graph of the equation. Thus, if the graph of an equation that is symmetric with respect to the y-axis contains the point $(-4, 0)$ (x-intercept is $-4$), then its graph also contains the point $(4, 0)$. Thus, $4$ is also an x-intercept of the graph.