Graph (3) has three real zeros, and the values of x and f(x) approach infinity and negative infinity at the same time
(a) Graphs with three zeros
This means that the graph crosses the x-axis three times
- Graphs (1) and (3) have this characteristic, because the graphs cross the x-axis three times
- Graphs (2) and (4) do not have this characteristic
(b) As x approaches negative infinity, f(x) approaches negative infinity
This means that the values of x and f(x) decrease at the same time
Only graph (3) have this characteristic
(c) As x approaches infinity, f(x) approaches infinity
This means that the values of x and f(x) increase at the same time
Only graph (3) have this characteristic
Hence, graph (3) has the given characteristics
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