Math Problem Statement

Find the coordinates of the vertex for the parabola defined by the quadratic function f(x) = 2x^2 - 8x + 3.

Solution

The given quadratic function is f(x)=2x28x+3f(x) = 2x^2 - 8x + 3. To find the vertex of a parabola represented by the quadratic function in standard form f(x)=ax2+bx+cf(x) = ax^2 + bx + c, we use the vertex formula:

x=b2ax = -\frac{b}{2a}

In this case:

  • a=2a = 2
  • b=8b = -8
  • c=3c = 3

Substitute the values of aa and bb into the formula for the x-coordinate of the vertex:

x=82(2)=84=2x = -\frac{-8}{2(2)} = \frac{8}{4} = 2

Now that we have the x-coordinate of the vertex, we substitute x=2x = 2 back into the original equation to find the y-coordinate:

f(2)=2(2)28(2)+3=2(4)16+3=816+3=5f(2) = 2(2)^2 - 8(2) + 3 = 2(4) - 16 + 3 = 8 - 16 + 3 = -5

Therefore, the coordinates of the vertex are (2,5)(2, -5).

Would you like more details or have any questions about this? Here are some related questions:

  1. What is the significance of the vertex in the graph of a quadratic function?
  2. How does the value of aa affect the shape and direction of the parabola?
  3. Can you explain how to convert a quadratic function to vertex form?
  4. What is the axis of symmetry for a parabola, and how is it related to the vertex?
  5. How would the graph of f(x)=2x28x+3f(x) = 2x^2 - 8x + 3 look like?

Tip: The vertex form of a quadratic function can make it easier to graph and understand the transformations of the parabola.

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Math Problem Analysis

Mathematical Concepts

Quadratic Functions
Parabolas
Vertex of a Parabola

Formulas

Vertex formula: x = -b / 2a
Substitute x into f(x) to find the y-coordinate

Theorems

Properties of parabolas
Axis of symmetry

Suitable Grade Level

Grades 9-11