Mathematics for IGCSE & O level - Graphs Of Functions (Section 3 - No. 31)
Which feature of a graph helps one determine if a function is a quadratic or not?
Whether it crosses the y-axis
Whether it is a smooth curve and has a U-shape
The location of the vertex
The number of x-intercepts
Explanation
A smooth U-shaped curve is a characteristic of a parabola, the graph of a quadratic function.
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