you don't. but you can graph both functions and observe how they behave in the two domains. More on reddit.com

Not sure what you mean by "get the answer", but here ( www.youtube.com/watch?v=kjdPFCX87nE ) is a video about how to graph piecewise functions on a TI-84, a pretty popular calculator in the US. More on reddit.com

Move up to select your function, then move left to select function name. Press exe and a new window will appear. You set the range there More on reddit.com

You can graph with Desmos . Here's an example: https://www.desmos.com/calculator/xrfmngtyoi . The syntax for defining a piecewise function should be clear from the example above, but to be explicit: f(x) = {[condition 1 on x]: [expression 1], [condition 2 on x]: [expression 2]}. The absolute value function over the reals would then be f(x) = {x >= 0: x, x < 0: -x} After defining your piecewise functions, plot the composition by adding the equation of that graph, i.e., if you've defined f and g, add the equation y = f(g(x)) or y = g(f(x)) to see the composition. More on reddit.com