Mathematics for IGCSE & O level - Sketching Curves (Section 4 - No. 25)
What is the sign of 'a' in a quadratic equation \(ax^2 + bx + c = y\) if the graph opens downwards?
a > 0
a < 0
a = 0
a = 1
Explanation
The sign of 'a' determines if the parabola opens upwards or downwards. A negative value indicates it opens downward.
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