OpenStudy (anonymous):

Referring to the figure, use the graph to estimate the roots of the equation: y = x2 - 4 http://www.ppstest2.com/images2/AL9009.jpg

5 years ago
OpenStudy (anonymous):

-2 and 2

5 years ago
OpenStudy (stamp):

The roots or solutions to a quadratic equations are the x values which the function is equal to zero. e.g. (x, 0)

5 years ago
OpenStudy (anonymous):

as the graph touches x-axis at this two points

5 years ago