Math Problem Statement

What are the key features and graph of the quadratic function f(x) = -5x^2 - 2x + 3?

Solution

The function provided in the image is f(x)=5x22x+3f(x) = -5x^2 - 2x + 3, and it seems that a point (5,3,5)(-5, 3, 5) is given, although the meaning of this point is not clear. Let me break down the problem and what might be expected:

Step-by-Step Explanation:

  1. Function Type: The function f(x)=5x22x+3f(x) = -5x^2 - 2x + 3 is a quadratic function, and its graph will be a parabola. Since the coefficient of x2x^2 is negative (5-5), the parabola opens downward.

  2. Key Features of the Quadratic Function:

    • Vertex: The vertex of a quadratic function ax2+bx+cax^2 + bx + c can be found using the formula x=b2ax = -\frac{b}{2a}. Here, a=5a = -5 and b=2b = -2.
    • Axis of Symmetry: The x-coordinate of the vertex is also the axis of symmetry for the parabola.
    • Y-Intercept: This is the point where x=0x = 0, which is simply f(0)=3f(0) = 3.
  3. Finding the Vertex: Let's compute the x-coordinate of the vertex using the formula x=b2ax = -\frac{b}{2a}:

    x=22(5)=210=0.2x = -\frac{-2}{2(-5)} = \frac{2}{-10} = -0.2

    Now, plug this value back into the function to find the y-coordinate of the vertex:

    f(0.2)=5(0.2)22(0.2)+3f(-0.2) = -5(-0.2)^2 - 2(-0.2) + 3 f(0.2)=5(0.04)+0.4+3f(-0.2) = -5(0.04) + 0.4 + 3 f(0.2)=0.2+0.4+3=3.2f(-0.2) = -0.2 + 0.4 + 3 = 3.2

    So, the vertex of the parabola is at (0.2,3.2)(-0.2, 3.2).

  4. Plotting the Graph:

    • The parabola will open downward, and its highest point (the vertex) is at (0.2,3.2)(-0.2, 3.2).
    • It crosses the y-axis at (0,3)(0, 3).
    • You can also find the x-intercepts by solving f(x)=0f(x) = 0 using the quadratic formula if needed.

Would you like more details about how to plot this graph, find the x-intercepts, or clarify the meaning of the point (5,3,5)(-5, 3, 5)?


Here are 5 related questions:

  1. How do you calculate the x-intercepts of the quadratic function f(x)=5x22x+3f(x) = -5x^2 - 2x + 3?
  2. How does the vertex form of a quadratic equation help in graphing the function?
  3. What is the significance of the axis of symmetry in a quadratic function?
  4. Can you describe how the leading coefficient affects the shape of the parabola?
  5. How can we confirm if the point (5,3,5)(-5, 3, 5) belongs to the parabola?

Tip: Remember that the vertex of a parabola can give you critical information about its highest or lowest point, depending on the direction it opens!

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Math Problem Analysis

Mathematical Concepts

Quadratic Function
Parabola
Vertex
Axis of Symmetry

Formulas

Vertex formula: x = -b / 2a
Quadratic function: f(x) = ax^2 + bx + c
Function evaluation to find y-coordinate: f(x)

Theorems

Quadratic Formula

Suitable Grade Level

Grades 9-11