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Solve each linear inequality. See Section 2.8. $$ 4(2 x-1) \geq 0 $$

Short Answer

Expert verified
The solution is \(x \geq \frac{1}{2}\).

Step by step solution

01

Distribute the 4

Begin by distributing the 4 across the terms inside the parentheses. Multiply 4 by each term: \(4 \times (2x-1) = 4 \times 2x - 4 \times 1 = 8x - 4\). The inequality becomes \(8x - 4 \geq 0\).
02

Add 4 to Both Sides

To solve for \(x\), we need to isolate \(8x\). Start by adding 4 to both sides of the inequality: \(8x - 4 + 4 \geq 0 + 4\). This simplifies to \(8x \geq 4\).
03

Divide by 8

We now divide both sides of the inequality by 8 to solve for \(x\): \(\frac{8x}{8} \geq \frac{4}{8}\). This simplifies to \(x \geq \frac{1}{2}\).
04

Write the Solution

The solution to the inequality \(4(2x-1) \geq 0\) is \(x \geq \frac{1}{2}\). This means \(x\) can be any number greater than or equal to \(\frac{1}{2}\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Solving Inequalities
When solving inequalities, our goal is to find all the values that make the inequality true. Inequalities are similar to equations but instead of an equal sign, they use symbols like \(<\), \(>\), \(\leq\), or \(\geq\). These symbols denote that one side of the inequality is less than, greater than, or equal to the other side.
This distinction means that the solutions to inequalities can describe a range of numbers rather than a specific value. To solve the inequality \(4(2x-1) \geq 0\), we must perform operations to isolate the variable \(x\). Each step must preserve the inequality's direction unless you multiply or divide by a negative number. In such a case, you would reverse the inequality symbol. This careful treatment ensures you find the correct range of solutions for \(x\).
The steps include simplifying expressions, using basic operations, and dividing or multiplying to isolate the variable.
Distributive Property
The distributive property is a fundamental concept in algebra that helps simplify expressions and solve equations or inequalities. It states that when you multiply a number by a sum or difference, you can distribute the multiplication over each term inside the parentheses. Mathematically, this is written as \(a(b + c) = ab + ac\).
In the given exercise, we apply the distributive property to \(4(2x-1)\). This means we multiply 4 by both \(2x\) and \(-1\), resulting in the expression \(8x - 4\).
Utilizing this property allows us to eliminate parentheses, making it easier to continue solving the inequality. Make sure that every term inside the parentheses gets multiplied by the number outside. This skill is crucial not only for solving inequalities but also for working with polynomials and other algebraic expressions.
Algebraic Manipulation
Algebraic manipulation involves various techniques to rearrange and simplify expressions or equations to solve for a variable. This process includes operations like adding, subtracting, multiplying, and dividing terms. The objective is to isolate the variable, making it the subject of the equation or inequality.
For the inequality \(8x - 4 \geq 0\), we begin by adding 4 to both sides, resulting in \(8x \geq 4\). This step moves us closer to isolating \(x\).
Next, divide both sides by 8 to solve for \(x\), simplifying the expression to \(x \geq \frac{1}{2}\). Remember, if you multiply or divide by a negative number during manipulation, you must reverse the inequality sign. However, since this operation doesn't involve a negative factor, we retain the direction of \(\geq\). Each operation systematically breaks down the inequality to make \(x\) easier to identify and understand.

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Most popular questions from this chapter

Baskets. Inc.. is planning to introduce a new woven basket. The company estimates that 500 dollars worth of new equipment will be needed to manufacture this new type of basket and that it will cost 15 dollars per basket to manufacture. The company also estimates that the revenue from each basket will be 31 dollars. a. Determine the revenue function \(R(x)\) from the sale of \(x\) baskets. b. Determine the cost function \(C(x)\) for manufacturing \(x\) baskets. c. Find the break-even point.

During the \(2006 \mathrm{NBA}\) playoffs, the top scoring player was Dwayne Wade of the Miami Heat. Wade scored a total of 654 points during the playoffs. The number of free throws (each worth one point) he made was three less than the number of two-point field goals he made. He also made 27 fewer three-point field goals than one-fifth the number of two-point field goals. How many free throws, two-point field goals, and three-point field goals did Dwayne Wade make during the 2006 playoffs? (Source: National Basketball Association) (IMAGE CANNOT COPY)

The fraction \(\frac{1}{24}\) can be written as the following sum: \(\frac{1}{24}=\frac{x}{8}+\frac{y}{4}+\frac{z}{3}\) where the numbers \(x, y,\) and \(z\) are solutions of $$ \left\\{\begin{aligned} x+y+z &=1 \\ 2 x-y+z &=0 \\ -x+2 y+2 z &=-1 \end{aligned}\right. $$ Solve the system and see that the sum of the fractions is \(\frac{1}{24}\)

Solving systems involving more than three variables can be accomplished with methods similar to those encountered in this section. Apply what you already know to solve each system of equations in four variables. $$\left\\{\begin{aligned} x+y+z+w &=5 \\ 2 x+y+z+w &=6 \\ x+y+z &=2 \\ x+y &=0 \end{aligned}\right.$$

Davie and Judi Mihaly own 50 shares of Apple stock and 60 shares of Microsoft stock. At the close of the markets on March \(9,2007,\) their stock portfolio was worth 6035.90 dollars. The closing price of the Microsoft stock was 60.68 dollars less than the closing price of Apple stock on that day. What was the price of each stock on March \(9,2007 ?\) (Source: New York Stock Exchange)

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