Question

Which graph represents a quadratic function that has one real zero?

Answer 1

A quadratic has exactly one real zero when its discriminant is zero (b^2 − 4ac = 0). Graphically this means the parabola is tangent to the x‑axis: its vertex lies on the x‑axis and the curve touches the axis at exactly one point.

So the correct graph is the parabola whose vertex is on the x‑axis (it may open up or down). Example: y = (x − 2)^2 touches the x‑axis at x = 2.

If you paste the answer choices or images I can point out which one matches.