Mathematics for IGCSE & O level - Graphs Of Functions (Section 2 - No. 2)
The graph of a quadratic function has a maximum value when which of the following is true about the leading coefficient?
It is positive.
It is negative.
It is zero.
It is equal to 1.
Explanation
A negative leading coefficient means the parabola opens downward, having a maximum value at its vertex.
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