## Secondary Math 2 Module 5 Answer Key

### Introduction

Welcome to the answer key for Secondary Math 2 Module 5! In this module, we will be diving into the world of quadratic functions and equations. This module builds upon the knowledge and skills developed in previous modules, focusing specifically on solving quadratic equations, graphing quadratic functions, and identifying key features of quadratic graphs. Whether you are a student looking for guidance or a teacher seeking additional resources, this answer key will provide you with the solutions and explanations you need to master Module 5.

### Lesson 1: Solving Quadratic Equations

In Lesson 1, we will be exploring different methods for solving quadratic equations. Quadratic equations are equations that can be written in the form ax^2 + bx + c = 0, where a, b, and c are constants. The goal is to find the values of x that satisfy the equation. In this lesson, we will cover the quadratic formula, factoring, and completing the square as methods for solving quadratic equations. Let's take a closer look at each of these methods.

### The Quadratic Formula

The quadratic formula is a powerful tool for solving quadratic equations. It states that for any quadratic equation ax^2 + bx + c = 0, the solutions can be found using the formula x = (-b ± √(b^2 - 4ac))/(2a). This formula allows us to find the exact solutions of any quadratic equation, regardless of whether the equation can be factored or not. By substituting the values of a, b, and c into the formula, we can solve for x.

### Factoring Quadratic Equations

Factoring is another method for solving quadratic equations. When a quadratic equation can be factored, we can rewrite it as (x - r)(x - s) = 0, where r and s are the solutions of the equation. By setting each factor equal to zero, we can solve for x and find the solutions of the equation. Factoring is a useful method when the quadratic equation has simple factors that can be easily identified.

### Completing the Square

Completing the square is a method for solving quadratic equations that involves rewriting the equation in a form that allows us to easily find the solutions. To complete the square, we take the coefficient of x, divide it by 2, square the result, and add it to both sides of the equation. This creates a perfect square trinomial on the left side, which can be factored and solved. Completing the square is particularly useful when we want to rewrite a quadratic equation in vertex form, which allows us to easily identify the vertex of the parabola.

### Lesson 2: Graphing Quadratic Functions

In Lesson 2, we will be exploring how to graph quadratic functions. A quadratic function is a function that can be written in the form f(x) = ax^2 + bx + c, where a, b, and c are constants. The graph of a quadratic function is a parabola, which can open upwards or downwards depending on the value of a. In this lesson, we will cover the steps for graphing quadratic functions, including finding the vertex, axis of symmetry, and x-intercepts.

### Finding the Vertex

The vertex of a quadratic function is the point on the graph where the parabola reaches its minimum or maximum value. To find the vertex, we can use the formula x = -b/(2a), which gives us the x-coordinate of the vertex. By substituting this value into the equation, we can find the y-coordinate of the vertex. The vertex form of a quadratic function, f(x) = a(x - h)^2 + k, also provides us with the coordinates of the vertex, where (h, k) is the vertex.

### Finding the Axis of Symmetry

The axis of symmetry is a vertical line that passes through the vertex of a quadratic function. It divides the parabola into two equal halves. The equation of the axis of symmetry can be found using the formula x = -b/(2a), which gives us the x-coordinate of the vertex. By substituting this value into the equation, we can find the equation of the axis of symmetry.

### Finding the X-Intercepts

The x-intercepts, also known as the zeros or roots, of a quadratic function are the points where the graph intersects the x-axis. To find the x-intercepts, we set the quadratic function equal to zero and solve for x. This can be done using any of the methods we learned in Lesson 1, such as factoring, using the quadratic formula, or completing the square.

### Lesson 3: Key Features of Quadratic Graphs

In Lesson 3, we will be exploring the key features of quadratic graphs. These features include the vertex, axis of symmetry, x-intercepts, and y-intercept. By analyzing these features, we can gain a deeper understanding of the behavior and shape of quadratic functions.

### Vertex and Axis of Symmetry

The vertex and axis of symmetry were introduced in Lesson 2, but they also play a crucial role in understanding the overall shape and symmetry of the quadratic graph. The vertex represents the minimum or maximum point of the parabola, while the axis of symmetry divides the parabola into two equal halves. These features provide important information about the behavior of the quadratic function.

### X-Intercepts

The x-intercepts, as mentioned in Lesson 2, are the points where the graph intersects the x-axis. They represent the solutions to the quadratic equation. By analyzing the x-intercepts, we can determine the number of real solutions the quadratic equation has and whether the parabola opens upwards or downwards.

### Y-Intercept

The y-intercept is the point where the graph intersects the y-axis. It represents the value of the quadratic function when x = 0. By finding the y-intercept, we can determine the starting point of the parabola and its relationship with the x-intercepts.

### Conclusion

Secondary Math 2 Module 5 provides a deep dive into quadratic functions and equations. By mastering the concepts and techniques covered in this module, students will have a solid foundation for future math courses and real-world applications. The answer key provided in this article offers thorough explanations and solutions, ensuring that students and teachers have the resources they need to succeed. So dive in, explore the world of quadratic functions, and unlock the power of Module 5!