Mathematics for IGCSE & O level - Graphs Of Functions (Section 3 - No. 21)
What does the 'a' value in y = a(x - h)² + k indicate about the parabola?
The y-intercept
The direction it opens and its width
The vertex of the parabola
The x-intercepts
Explanation
The 'a' value determines if it opens upwards or downwards and also affects the width of the parabola.
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