The leftmost graph, which has a curve that goes up forever as x approaches positive or negative infinity, has the end behavior as x approaches positive or negative infinity, f(x) approaches positive infinity.
The rightmost graph, which has a curve that goes down forever as x approaches positive or negative infinity, has the end behavior as x approaches positive or negative infinity, f(x) approaches negative infinity.
Two graphs are presented with contrasting end behaviors. The leftmost graph's curve rises continually towards positive or negative infinity, signifying that f(x) approaches positive infinity in both directions. Conversely, the rightmost graph's curve descends endlessly, indicating that f(x) approaches negative infinity as x approaches either positive or negative infinity.