The Minimum Point of a Parabola

Oct 13, 2025 by windailys.com 94 views

When analyzing the graph of a function, it's essential to understand the characteristics of the curve, including its shape, orientation, and key points. In this article, we'll focus on a specific type of graph: a parabola with a minimum point. We'll explore the properties of this graph and determine which equation could represent the function.

What is a Parabola?

A parabola is a U-shaped curve that can open upwards or downwards. It's a quadratic function, which means it can be represented by an equation in the form of ${f(x) = ax^2 + bx + c}$ , where ${a}$ , ${b}$ , and ${c}$ are constants. The graph of a parabola can have a maximum or minimum point, depending on the value of ${a}$ .

The Minimum Point of a Parabola

The minimum point of a parabola is the lowest point on the curve. It's the vertex of the parabola, and it's represented by the coordinates ${(h, k)}$ . In the given problem, the minimum point is ${(-3, 9)}$ . This means that the vertex of the parabola is located at the point ${(-3, 9)}$ .

Properties of a Parabola with a Minimum Point

A parabola with a minimum point has several key properties:

The parabola opens upwards.
The vertex is the lowest point on the curve.
The axis of symmetry passes through the vertex.
The parabola is symmetric about the axis of symmetry.

Equations of a Parabola with a Minimum Point

The equation of a parabola with a minimum point can be represented in the form of ${g(x) = a(x - h)^2 + k}$ , where ${(h, k)}$ is the vertex of the parabola. In this case, the vertex is ${(-3, 9)}$ , so the equation can be written as ${g(x) = a(x + 3)^2 + 9}$ .

Analyzing the Options

Now, let's analyze the given options to determine which equation could represent the function.

Option A: ${g(x)=-\frac{1}{2}(x-3)^2+9}$

This equation represents a parabola with a minimum point at ${(3, 9)}$ . However, the given problem states that the minimum point is ${(-3, 9)}$ , not ${(3, 9)}$ . Therefore, this option is incorrect.

Option B: ${g(x)=-(x+3)^2+9}$

This equation represents a parabola with a minimum point at ${(-3, 9)}$ . The parabola opens downwards, and the axis of symmetry passes through the vertex. This option matches the given problem, and it's the correct answer.

Option C: ${g(x)=-\frac{1}{2}(x+3)^2+9}$

This equation represents a parabola with a minimum point at ${(-3, 9)}$ . However, the coefficient of the squared term is ${-\frac{1}{2}}$ , which means the parabola opens downwards. This option is incorrect because the given problem states that the parabola opens upwards.

Conclusion

In conclusion, the correct answer is Option B: ${g(x)=-(x+3)^2+9}$ . This equation represents a parabola with a minimum point at ${(-3, 9)}$ , and it matches the given problem. The parabola opens upwards, and the axis of symmetry passes through the vertex.

Key Takeaways

A parabola with a minimum point has a vertex at the lowest point on the curve.
The axis of symmetry passes through the vertex.
The parabola is symmetric about the axis of symmetry.
The equation of a parabola with a minimum point can be represented in the form of ${g(x) = a(x - h)^2 + k}$ , where ${(h, k)}$ is the vertex of the parabola.

Final Thoughts

In our previous article, we explored the properties of a parabola with a minimum point and determined which equation could represent the function. In this article, we'll answer some frequently asked questions about parabolas with a minimum point.

Q: What is the vertex of a parabola?

A: The vertex of a parabola is the lowest point on the curve. It's the point where the parabola changes direction, and it's represented by the coordinates ${(h, k)}$ .

Q: How do I find the vertex of a parabola?

A: To find the vertex of a parabola, you need to know the equation of the parabola. The vertex is represented by the coordinates ${(h, k)}$ , where ${h}$ is the x-coordinate and ${k}$ is the y-coordinate. You can find the vertex by using the formula ${h = -\frac{b}{2a}}$ and ${k = f(h)}$ .

Q: What is the axis of symmetry of a parabola?

A: The axis of symmetry of a parabola is a vertical line that passes through the vertex of the parabola. It's a line of symmetry, and the parabola is symmetric about this line.

Q: How do I determine the direction of a parabola?

A: To determine the direction of a parabola, you need to look at the coefficient of the squared term in the equation. If the coefficient is positive, the parabola opens upwards. If the coefficient is negative, the parabola opens downwards.

Q: What is the equation of a parabola with a minimum point?

A: The equation of a parabola with a minimum point can be represented in the form of ${g(x) = a(x - h)^2 + k}$ , where ${(h, k)}$ is the vertex of the parabola.

Q: How do I graph a parabola with a minimum point?

A: To graph a parabola with a minimum point, you need to know the equation of the parabola. You can use the vertex form of the equation to graph the parabola. The vertex is the lowest point on the curve, and the parabola is symmetric about the axis of symmetry.

Q: What are some real-world applications of parabolas with a minimum point?

A: Parabolas with a minimum point have many real-world applications, including:

Projectile motion: The trajectory of a projectile, such as a thrown ball or a rocket, follows a parabolic path.
Optics: The shape of a mirror or a lens can be represented by a parabola with a minimum point.
Engineering: The design of bridges, arches, and other structures can involve parabolas with a minimum point.

Q: How do I solve problems involving parabolas with a minimum point?

A: To solve problems involving parabolas with a minimum point, you need to understand the properties of the parabola and the equation that represents it. You can use algebraic techniques, such as factoring and solving quadratic equations, to solve problems involving parabolas with a minimum point.

Conclusion

In conclusion, parabolas with a minimum point are an essential concept in mathematics. By understanding the properties of the parabola and the equation that represents it, you can solve problems involving parabolas with a minimum point. We hope this Q&A article has been helpful in answering your questions about parabolas with a minimum point.

Key Takeaways

The vertex of a parabola is the lowest point on the curve.
The axis of symmetry of a parabola is a vertical line that passes through the vertex.
The equation of a parabola with a minimum point can be represented in the form of ${g(x) = a(x - h)^2 + k}$ , where ${(h, k)}$ is the vertex of the parabola.
Parabolas with a minimum point have many real-world applications, including projectile motion, optics, and engineering.

Final Thoughts

Understanding parabolas with a minimum point is essential in mathematics. By analyzing the equation and the graph of the function, you can determine the characteristics of the curve and make informed decisions. We hope this Q&A article has been helpful in answering your questions about parabolas with a minimum point.