Absolute Value is a magnitude of real number without regarding to its signs.

The absolute value has the form of y =  |f(x)|, where f(x) is a function.

The x-intercept of the graph of y = f(x) is a critical point also known as point of reflection.

So when there is an absolute value symbol, the line always reflects.

As long as we know the concept of an Absolute Value, it is easy to solve problem solving questions.