Mathematics for IGCSE & O level - Graphs Of Functions (Section 5 - No. 25)
If a is negative, what shape will the quadratic graph y = ax^2 + bx + c display?
A 'U' shape.
An upside-down 'U' shape.
An S-shape.
A straight line.
Explanation
If a < 0, then the parabola opens downwards.
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