It means that the function is not defined for a part of the domain.
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The word graph can be used either as a noun or a verb. As a noun, it means a picture or visualization of some mathematical term or relationship. The most usual type of graph is the Cartesian coordinate system invented by the great French mathematician, René Descartes, but there are several other types. As a verb, to graph is to depict in the form of a graph, as in, graph that equation.
Term is a mathematical factor. It is a number on a graph. You have to solve it then. Sorry that this wasn't very helpful, but that is all I can think of.
Bar Graph Pie Chart Line Graph Venn Diagram Tally Chart Pictograph
Linear