QCM : Mastering Quadratic Graphs and Solutions — 8 questions

Questions et réponses du QCM

1. How do the vertex and the axis of symmetry of a quadratic graph relate to each other?

The vertex lies on the axis of symmetry, which is a horizontal line.
The axis of symmetry is always perpendicular to the vertex.
The vertex and the axis of symmetry are the same point.
The vertex is always located on the axis of symmetry.

The vertex is always located on the axis of symmetry.

Explication

The vertex is always located on the axis of symmetry, which passes through the vertex, making option 0 correct. The axis of symmetry is a vertical line, not perpendicular to the vertex point itself, but passing through it. The vertex and the axis are different features, with the axis being a line and the vertex a point on the parabola.

2. What is the role of the vertex in a quadratic graph?

It is the highest or lowest point on the parabola, indicating a change in direction.
It is the point where the parabola crosses the x-axis.
It is the maximum distance from the vertex to the x-axis.
It is the point where the parabola intersects the y-axis.

It is the highest or lowest point on the parabola, indicating a change in direction.

Explication

The vertex is either the highest or lowest point on the parabola, marking where the graph changes direction, which is fundamental in understanding the graph's shape.

3. A quadratic equation has a discriminant value of 9. How many real solutions does it have?

Zero solutions
Four solutions
Two solutions
One solution

Two solutions

Explication

Since the discriminant is positive (9), the quadratic equation has two real solutions, as indicated by the source stating that a positive discriminant corresponds to two solutions.

4. How does the axis of symmetry relate to the parabola's vertex?

It passes through the vertex and divides the parabola into two mirror-image halves.
It is parallel to the x-axis and passes through the roots.
It is always located at the origin.
It crosses the parabola at its lowest point.

It passes through the vertex and divides the parabola into two mirror-image halves.

Explication

The axis of symmetry is a vertical line passing through the vertex, creating two mirror images of the parabola, which helps in graphing and analyzing the parabola's properties.

5. Which of the following describes the concavity of a parabola that opens downward?

It opens downward, and the vertex is a maximum point.
It opens upward, with a minimum vertex.
It is concave upward, with a minimum point.
It opens downward, but the vertex is a minimum.

It opens downward, and the vertex is a maximum point.

Explication

A parabola opening downward is concave downward, and its vertex represents a maximum point on the graph.

6. What does a discriminant value of 0 indicate about the solutions of a quadratic equation?

The quadratic has exactly one real solution, which is a repeated root.
The quadratic has two distinct real solutions.
The quadratic has no real solutions.
The solutions are complex and conjugate.

The quadratic has exactly one real solution, which is a repeated root.

Explication

A discriminant of 0 means the quadratic has exactly one real solution, which is a repeated root, indicating the parabola touches the x-axis at just one point.

7. In quadratic graphs, what is the significance of the range?

It includes all the y-values the parabola can take, starting from the vertex's y-value depending on the concavity.
It is the set of all x-values the graph can take.
It is only the interval between the roots.
It refers to the total length of the parabola.

It includes all the y-values the parabola can take, starting from the vertex's y-value depending on the concavity.

Explication

The range of a quadratic function includes all possible y-values the parabola can attain, starting from the vertex's y-value either up or down to infinity, based on the parabola's opening direction.

8. How does the vertex's y-value determine the range of a quadratic function that opens upward?

The range starts at the y-value of the vertex and extends to positive infinity.
The range includes only the y-value at the vertex.
The range extends from negative infinity to the vertex's y-value.
The range is limited to the y-values between the roots.

The range starts at the y-value of the vertex and extends to positive infinity.

Explication

For a parabola opening upward, the vertex's y-value is the minimum point, so the range begins there and extends upward to positive infinity.

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Quadratic graph features — define?

Vertex, axis of symmetry, concavity, and range.

Vertex — definition?

Highest or lowest point on parabola.

Number of solutions — determined by?

Discriminant value (b² - 4ac).

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