Algebra 2B Discussion-Based Assessment1. Solve The Equation: $\log(5x + 20) = 2$. What Value Of $x$ Satisfies This Equation?2. Stella Wants To Save Money To Buy A New Laptop. Every Month She Sets Aside An Increasing Amount Of Money To

Introduction

Algebra 2B is a crucial subject that builds upon the foundational concepts of algebra. It involves solving equations, graphing functions, and analyzing mathematical relationships. In this discussion-based assessment, we will delve into two problems that require critical thinking and problem-solving skills.

Problem 1: Solving the Equation

Logarithmic Equation

We are given the equation $\log(5x + 20) = 2$. Our goal is to find the value of $x$ that satisfies this equation.

To solve this equation, we need to use the properties of logarithms. We can start by rewriting the equation in exponential form:

$$5x + 20 = 10^2$$

Simplifying the equation, we get:

$$5x + 20 = 100$$

Subtracting 20 from both sides, we get:

$$5x = 80$$

Dividing both sides by 5, we get:

$$x = 16$$

Therefore, the value of $x$ that satisfies the equation is $x = 16$.

Explanation

In this problem, we used the property of logarithms that states $\log_a(b) = c$ is equivalent to $a^c = b$. We applied this property to rewrite the equation in exponential form and then solved for $x$.

Problem 2: Stella's Savings

Increasing Amount of Money

Stella wants to save money to buy a new laptop. Every month, she sets aside an increasing amount of money to reach her goal. Let's assume that Stella sets aside $x$ dollars in the first month, $2x$ dollars in the second month, $3x$ dollars in the third month, and so on.

We can represent the total amount of money Stella sets aside after $n$ months as:

$$S_n = x + 2x + 3x + \cdots + nx$$

This is an arithmetic series with first term $x$ and common difference $x$. The sum of the first $n$ terms of an arithmetic series is given by:

$$S_n = \frac{n}{2} (2a + (n - 1)d)$$

where $a$ is the first term and $d$ is the common difference.

In this case, $a = x$ and $d = x$. Plugging these values into the formula, we get:

$$S_n = \frac{n}{2} (2x + (n - 1)x)$$

Simplifying the expression, we get:

$$S_n = \frac{n}{2} (x + nx)$$

$$S_n = \frac{n}{2} (x + nx)$$

$$S_n = \frac{n}{2} (x(1 + n))$$

$$S_n = \frac{n^2x + nx}{2}$$

Therefore, the total amount of money Stella sets aside after $n$ months is given by the expression:

$$S_n = \frac{n^2x + nx}{2}$$

Explanation

In this problem, we used the formula for the sum of an arithmetic series to find the total amount of money Stella sets aside after $n$ months. We represented the total amount of money as an arithmetic series and then applied the formula to find the sum.

Conclusion

In this discussion-based assessment, we solved two problems that required critical thinking and problem-solving skills. We used the properties of logarithms to solve the first equation and the formula for the sum of an arithmetic series to solve the second problem. These problems demonstrate the importance of algebra in real-world applications and the need for critical thinking and problem-solving skills in mathematics.

Discussion Questions

1. What is the value of $x$ that satisfies the equation $\log(5x + 20) = 2$?
2. What is the total amount of money Stella sets aside after $n$ months?
3. How can we use the formula for the sum of an arithmetic series to solve real-world problems?
4. What are some real-world applications of algebra?
5. How can we use critical thinking and problem-solving skills to solve mathematical problems?

References

• [1] "Algebra 2B" by [Author's Name]
• [2] "Mathematics for the Real World" by [Author's Name]

Note

Introduction

Algebra 2B is a crucial subject that builds upon the foundational concepts of algebra. It involves solving equations, graphing functions, and analyzing mathematical relationships. In this Q&A article, we will address some common questions and provide detailed explanations to help students better understand the concepts.

Q1: What is the difference between a linear equation and a quadratic equation?

A1: A linear equation is an equation in which the highest power of the variable is 1. For example, 2x + 3 = 5 is a linear equation. A quadratic equation, on the other hand, is an equation in which the highest power of the variable is 2. For example, x^2 + 4x + 4 = 0 is a quadratic equation.

Q2: How do I solve a quadratic equation?

A2: To solve a quadratic equation, you can use the quadratic formula:

x = (-b ± √(b^2 - 4ac)) / 2a

where a, b, and c are the coefficients of the quadratic equation.

Q3: What is the difference between a function and a relation?

A3: A function is a relation between a set of inputs (called the domain) and a set of possible outputs (called the range). In other words, for every input, there is exactly one output. A relation, on the other hand, is a set of ordered pairs that do not necessarily have a one-to-one correspondence between the inputs and outputs.

Q4: How do I graph a function?

A4: To graph a function, you can use the following steps:

1. Determine the domain and range of the function.
2. Choose a set of x-values to plot.
3. Calculate the corresponding y-values using the function.
4. Plot the points on a coordinate plane.
5. Draw a smooth curve through the points to represent the function.

Q5: What is the difference between a linear function and a nonlinear function?

A5: A linear function is a function in which the highest power of the variable is 1. For example, f(x) = 2x + 3 is a linear function. A nonlinear function, on the other hand, is a function in which the highest power of the variable is greater than 1. For example, f(x) = x^2 + 4x + 4 is a nonlinear function.

Q6: How do I solve a system of linear equations?

A6: To solve a system of linear equations, you can use the following methods:

1. Graphing: Graph the two equations on the same coordinate plane and find the point of intersection.
2. Substitution: Solve one equation for one variable and substitute the expression into the other equation.
3. Elimination: Add or subtract the two equations to eliminate one variable.

Q7: What is the difference between a dependent variable and an independent variable?

A7: An independent variable is a variable that is not dependent on any other variable. For example, in the equation y = 2x + 3, x is the independent variable. A dependent variable, on the other hand, is a variable that is dependent on another variable. For example, in the equation y = 2x + 3, y is the dependent variable.

Q8: How do I determine the domain and range of a function?

A8: To determine the domain and range of a function, you can use the following steps:

1. Identify the type of function (linear, quadratic, polynomial, etc.).
2. Determine the restrictions on the domain (e.g., x cannot be equal to 0).
3. Determine the restrictions on the range (e.g., y cannot be equal to 0).
4. Use the function to determine the domain and range.

Conclusion

In this Q&A article, we addressed some common questions and provided detailed explanations to help students better understand the concepts of algebra 2B. We covered topics such as linear and quadratic equations, functions and relations, graphing, and systems of linear equations. We hope this article has been helpful in clarifying any doubts and providing a better understanding of the subject.

References

• [1] "Algebra 2B" by [Author's Name]
• [2] "Mathematics for the Real World" by [Author's Name]

Note

This Q&A article is designed to help students develop a deeper understanding of the concepts of algebra 2B. The questions and answers are meant to be helpful and informative, and are not intended to be a substitute for a textbook or other educational resources.