Absolute value
The parent function of absolute value functions is f(x) = x. It is an even function that has a sharp turn at the bottom. The graph of this function is:
The absolute value function can also be described as a piecewise function:
f(x) = 


To transform the absolute value function, the general form of function transformations can be applied:
f(x) = ab(x + c) + d
See also function transformations, piecewise functions.