Visualizing Square Root and Absolute Value
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Taking the absolute value of a number leaves the number unchanged if the number is non-negative and changes the sign of the number otherwise. Thus, when you take the absolute value of a function, the effect on the graph is to leave portions above the axis unchanged and to reflect portions below the axis through the axis.
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Contributed by: Chris Boucher (March 2011)
Open content licensed under CC BY-NC-SA
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