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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
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OpenStudy (anonymous):
-2 and 2
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)
OpenStudy (anonymous):
as the graph touches x-axis at this two points
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