(Section 1.3: Basic Graphs and Symmetry) 1.3.19 PART N: ABSOLUTE VALUE FUNCTIONWe discussed the absolute value operation in Section 0.4. The piecewise definitionof the absolute value function(on ±) is given by: fx()=x=x,ifx±0²xfx<0³´µ• We will discuss more piecewise-defined functions in Section 1.5. fis an algebraicfunction, because we can write: =x=x2. WARNING 7:Writing x2as x2/2would be inappropriate if it is construed as x, which would notbe equivalent for x<0, or as x2, which has domain 0,±²
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