Quadratic Transformations & Completing the Square
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Questions and Answers

What is the vertex of the quadratic relation $y = -(x-2)^2 + 9$?

  • (-2, 9)
  • (2, -9)
  • (2, 9) (correct)
  • (9, 2)

The quadratic function $y = 2(x + 7)^2 - 4$ opens downwards.

False (B)

What is the axis of symmetry for the function $y = -(x-2)^2 + 9$?

x = 2

The function $y = 2(x + 7)^2 - 4$ has its vertex at the point (______, ______).

<p>-7, -4</p> Signup and view all the answers

Match the transformation with its description:

<p>Reflection across x-axis = The graph flips upside down Horizontal shift right = The graph moves to the right Vertical shift up = The graph moves upwards U-shape opening = The parabola opens upwards</p> Signup and view all the answers

Which transformation describes $y = -(x - 2)^2 + 9$?

<p>Reflection across x-axis and vertical shift up 9 units (B)</p> Signup and view all the answers

Identify the direction of opening for the quadratic relation $y = 2(x + 7)^2 - 4$. What is it?

<p>Upwards</p> Signup and view all the answers

The step pattern for the quadratic function $y = -(x-2)^2 + 9$ is __________.

<p>1, 3, 5</p> Signup and view all the answers

What is the expression of the quadratic relation derived from the transformations provided?

<p>y = 3x^2 - 6x + 6 (C)</p> Signup and view all the answers

The expression y = 6(2x^2 - 2) represents a quadratic equation.

<p>True (A)</p> Signup and view all the answers

What is the vertex form of a quadratic equation?

<p>y = a(x - h)^2 + k</p> Signup and view all the answers

The ______ transformation involves shifting the graph of the function vertically.

<p>vertical</p> Signup and view all the answers

Match the following parts of a quadratic relation with their descriptions:

<p>a = The coefficient of x^2, dictates the opening direction h = The x-coordinate of the vertex k = The y-coordinate of the vertex b = The coefficient of x, influences the slope of the vertex</p> Signup and view all the answers

What is the vertex of the quadratic relation given by the equation $y = 2(x - 1)^2 + 3$?

<p>(1, 3) (C)</p> Signup and view all the answers

A quadratic relation can be written in vertex form, standard form, and factored form.

<p>True (A)</p> Signup and view all the answers

In the equation $y = 2(x - 1)^2 + 3$, what is the value of 'a'?

<p>2</p> Signup and view all the answers

The quadratic relation $y = 3(x + 1)^2 - 2$ can be rewritten in standard form as $y = _____$.

<p>3x^2 + 6x + 1</p> Signup and view all the answers

Match each term to its description:

<p>Vertex = The highest or lowest point of a parabola Standard Form = Form represented as $y = ax^2 + bx + c$ Completing the Square = A method to convert a quadratic equation into vertex form Quadratic Formula = A formula used to find the roots of a quadratic equation</p> Signup and view all the answers

Flashcards

Completing the Square

In a quadratic expression, Completing the Square is a technique used to transform the expression into a perfect square trinomial, which enables you to rewrite the expression in vertex form.

Vertex Form of a Quadratic Relation

The vertex form of a quadratic relation is given by y = a(x - h)^2 + k, where (h, k) represents the coordinates of the vertex.

Perfect Square Trinomial

A perfect square trinomial is a trinomial that can be factored as the square of a binomial. For example, x^2 + 6x + 9 is a perfect square trinomial because it can be factored as (x + 3)^2.

Standard Form of a Quadratic Relation

The Standard Form of a quadratic relation is given by y = ax^2 + bx + c.

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Changing Forms of Quadratic Equations

Changing the form of a quadratic from Vertex Form to Standard Form or vice versa involves manipulating the equation to achieve the desired structure.

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Vertex

The highest or lowest point on a parabola, represented by the coordinates (h, k).

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Axis of Symmetry

The vertical line that divides the parabola symmetrically, represented by the equation x = h.

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Direction of Opening

Indicates the direction the parabola opens, either upwards or downwards. A positive coefficient means it opens upwards, and a negative coefficient means it opens downwards.

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Maximum/Minimum Value

The maximum or minimum value the parabola reaches, it corresponds to the y-coordinate of the vertex.

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Vertical Stretch/Compression

Indicates the stretch or compression of the parabola compared to the parent function y = x^2.

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Horizontal Shift

Indicates a horizontal shift of the parabola left or right, the shift is determined by the value inside the parentheses alongside x.

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Vertical Shift

Indicates a vertical shift of the parabola upwards or downwards, the shift is determined by the constant term outside the parentheses.

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Vertical Reflection

A transformation that flips the graph across the x-axis, indicated by a negative sign in front of the entire equation.

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Vertex Form of a Quadratic

A mathematical expression that represents a quadratic function in a form that directly reveals its vertex and other key features.

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Vertical Stretch/Compression Factor

A numerical value that determines the vertical stretch or compression of a parabola. A value greater than 1 stretches, while a value between 0 and 1 compresses.

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Study Notes

Unit 3 - Vertex Form Test Re-Write

  • Quadratic Transformations (a):

  • Relation: y = (x - 2)² + 9

  • Vertex: (2, 9)

  • Axis of Symmetry: x = 2

  • Maximum Value: 9

  • Step Pattern: 1, 3, 5

  • Transformations: Horizontal shift 2 units right, vertical shift 9 units up

  • Quadratic Transformations (b):

  • Relation: y = 2(x + 7)² – 4

  • Vertex: (-7, -4)

  • Axis of Symmetry: x = -7

  • Minimum Value: -4

  • Step Pattern: 2, 6, 10

  • Transformations: Vertical stretch by a factor of 2, horizontal shift 7 units left, vertical shift 4 units down

Completing the Square

  • Example (a):

  • Relation: y = 2x² - 4x + 5

  • Vertex form: y = 2(x - 1)² + 3

  • Vertex: (1, 3)

  • Example (b):

  • Relation(a) :y = 3(x + 1)² – 2 Standard form: y = 3x² + 6x + 4

  • Relation(b) :y = 2(x + 1)(2x – 2) Standard form: y = 4x² - 4

Spicy Vertex Form

  • Transformations:
  • Vertical reflection across the x-axis
  • Vertical stretch by a factor of 4
  • Horizontal shift 5 units to the right
  • Vertical shift 2 units up
  • Quadratic relation: y = -4(x - 5)² + 2

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Description

This quiz focuses on understanding quadratic transformations and the process of completing the square. It covers concepts such as vertex form, axis of symmetry, maximum and minimum values, and various transformations. Test your knowledge on how to rewrite quadratic equations in vertex form and identify their characteristics.

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