Mathematics for IGCSE & O level - Graphs Of Functions (Section 6 - No. 24)
In the equation of a quadratic graph, y = ax^2 + bx + c, what determines the direction the parabola opens?
The value of b
The value of c
The value of a
The values of b and c combined
Explanation
The sign of 'a' determines if the parabola opens up (a > 0) or down (a < 0).
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