Mathematics for IGCSE & O level - Graphs Of Functions (Section 2 - No. 40)
If a quadratic equation has one real root, how does its graph interact with the x-axis?
It does not intersect the x-axis
It intersects the x-axis at two points.
It touches the x-axis at one point.
It passes through the origin
Explanation
If it has one real root, it touches the x-axis at the vertex.
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