Mathematics for IGCSE & O level - Sketching Curves (Section 1 - No. 20)
What does the 'a' value determine in the quadratic graph y = ax² + bx + c?
The y-intercept
The axis of symmetry.
The direction of opening.
The x-intercept(s).
คำอธิบาย
The 'a' value determines whether the parabola opens upwards (a>0) or downwards (a<0).