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91Ó°ÊÓ

Look at each of the following inequality statements and determine whether they make sense. Explain your answers. (a) \(-3x<3\) (e) \(3x>4\)

Short Answer

Expert verified
(a) correct, (b) incorrect, (c) incorrect, (d) incorrect, (e) incorrect, (f) incorrect.

Step by step solution

01

Analyze inequality (a)

Examine the inequality \(-3<x<2\). This inequality states that \(x\) is between -3 and 2, exclusively. This is a valid inequality because -3 is less than 2, so there are possible values for \(x\) that lie in this range.
02

Analyze inequality (b)

Examine the inequality \(-5<x<-8\). This inequality states that \(x\) is between -5 and -8. This does not make sense because -5 is greater than -8, so it is not possible for \(x\) to lie in this range.
03

Analyze inequality (c)

Examine the inequality \(7<x<4\). This inequality states that \(x\) is between 7 and 4. This does not make sense because 7 is greater than 4, so it is not possible for \(x\) to lie in this range.
04

Analyze inequality (d)

Examine the inequality \(6>x<3\). This inequality is incorrectly formatted. Inequalities should always have the lower number on the left. The correct way to express it would be \(3<x<6\). Thus, the given inequality does not make sense.
05

Analyze inequality (e)

Examine the inequality \(3<x<-2\). This inequality states that \(x\) is between 3 and -2. This does not make sense because 3 is greater than -2, so it is not possible for \(x\) to lie in this range.
06

Analyze inequality (f)

Examine the inequality \(-5>x>4\). This inequality states that \(x\) is between -5 and 4 in the reverse order. This does not make sense because -5 is less than 4, so it is not possible for \(x\) to lie in this range.

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Key Concepts

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

Valid Inequality
In algebra, a valid inequality is an inequality statement that logically makes sense. Inequalities are used to show the relative size or order of two values. For an inequality to be valid, it must accurately compare those values.

For example, the inequality \(-3 < x < 2\) is valid because -3 is less than 2. This means there exist possible values for `x` that lie between -3 and 2, such as -1, 0, or 1.

Conversely, the inequality \(-5 < x < -8\) is invalid because -5 is greater than -8, making it impossible for `x` to lie between -5 and -8. When checking inequalities, always ensure that the comparative statement makes logical sense.
Order of Inequalities
The order in which numbers are written in an inequality is crucial. A correctly ordered inequality has the smaller number on the left and the larger number on the right. This convention helps make sense of the logical range where the variable can lie.

For instance, the inequality \(-3 < x < 2\) means that `x` lies between -3 and 2, which follows the correct order. However, an inequality written as \(-5 < x < -8\) is not correctly ordered because -5 should be on the right side since it is greater than -8.

If an inequality is presented in an incorrect order, like \(-5 > x > 4\), it means the statement is faulty and must be rewritten properly. The correct format ensuring logical comparison is essential for understanding algebraic inequalities.
Algebraic Reasoning
Algebraic reasoning involves understanding and using algebraic concepts to interpret and solve problems. When working with inequalities, you often need to reason through the relationship between numbers and variables.

When we examine an inequality like \(-3 < x < 2\), algebraic reasoning helps us see that `x` must be a value that satisfies the condition of being greater than -3 but less than 2. This is an inclusive approach that ensures all possible values are considered.

For inequalities that don't make sense, such as \(-5 < x < -8\), reasoning helps us identify the error. We understand from basic arithmetic that -5 is greater than -8, making the range impossible. Thus, by logically evaluating the inequality's order and values, we can correctly interpret and solve problems.

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