Mathematics for IGCSE & O level - Sketching Curves (Section 2 - No. 30)
The function y = -x² + 4 describes a downward-opening parabola. What can we say about its turning point?
It is a minimum
It is a maximum
It's not a turning point
It's at (0, 0)
Explanation
A negative coefficient of x² indicates a maximum turning point.
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