Tell

The things that i learnt this week are: Absolute Value Functions and solving absolute value equations.

An absolute value function has the form y=|f(x)|, where f(x) is a function. The x-intercept of the graph of y=f（x）is a critical point. The graph of y=|f（x）| changes direction at this point..

Graph the absolute value of a linear function we should know the intercepts, domain, the range of the function. To see how to join the points with a smooth curve, sketch the graph of the quadratic function then reflect, in the x-axis, in the part that is below the x-axis.

Piecewise notation is used to describe  a function that was different definitions for different subsets of the domain.