Library+of+Functions-Target+A+Extension+-+Writing+Absolute+Value+Functions

Just like with graphing absolute value functions, when writing absolute value functions, there are three key pieces of information that is needed: a, h, and k. Remember that the vertex of the graph of a function represents (h, k). So when writing a function, once the a, h, and k have been identified, it is just a matter of substituting those values into the standard equation for an absolute value function: f(x) = a|x - h| + k. Watch the videos below to see some examples on how to write an absolute value function from a graph. media type="youtube" key="8a578bA3pio" height="360" width="640"

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