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Solve the inequalities. (See Examples \(1-2)\) $$ (4 x+1)^{2}>-6 $$

Short Answer

Expert verified
The inequality is true for all real numbers.

Step by step solution

01

Analyze the Inequality Structure

Consider the inequality \( (4x+1)^2 > -6 \). Notice that a square of any real number is always non-negative (i.e., \( (a)^2 \geq 0 \) for any real number \( a \)).
02

Compare to Negative Number

Since \((4x + 1)^2\) is always greater than or equal to 0, it will always be greater than -6, because every number that is greater than or equal to 0 is necessarily greater than -6.
03

Conclude the Solution

Since \((4x + 1)^2\) is always greater than -6 regardless of the value of \( x \), the inequality \((4x + 1)^2 > -6\) holds true for all values of \( x \).

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Key Concepts

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

Inequality Structure Analysis
In algebra, understanding the structure of an inequality is crucial. Let's analyze the given inequality \( (4x+1)^2 > -6 \). Notice that we are dealing with a quadratic expression inside a square term. The square of any real number is always non-negative, meaning it can never be less than zero but can be zero or positive. This helps us fundamentally: any quadratic squared term like \( (4x+1)^2 \) must be greater than or equal to zero. This fundamental property will play a significant role in solving the inequality.

It's important to recognize that because the square term cannot be negative, we can automatically conclude that it will always be greater than any negative number, such as -6 in this example.
Non-negative Property of Squares
Quadratic expressions squared involve the non-negative property. Consider \( a \) as any real number. When squared, \( a^2 \) will always be greater than or equal to zero. Thus, \( (4x+1)^2 \) follows this rule.

Since \( (4x+1)^2 \) is non-negative, it is always zero or positive. Therefore, comparing it to -6, which is negative, any non-negative value will certainly be greater than -6. This is key in solving these types of inequalities. It simplifies the problem because no specific values for \( x \) need to be calculated to conclude the inequality holds. Understanding this principle allows for quick and effective solutions to quadratic inequalities involving squares.
Solving Quadratic Inequalities
Now, let's put everything together to solve quadratic inequalities. The inequality \( (4x+1)^2 > -6 \) involves a squared term on the left-hand side. Given what we know about non-negative properties, we analyze it further:

\( (4x+1)^2 \) is always \[ \geq 0 \] which is always true: zero or positive numbers are indeed greater than any negative number.

Therefore, no matter which value \( x \) takes, the inequality \( (4x+1)^2 > -6 \) holds true. The solution to this inequality is all real numbers. Since \( x \) can be any value from negative infinity to positive infinity, we conclude with absolute certainty that the inequality is valid for all \( x \). This means there are no restrictions on \( x \), leading to a comprehensive and effective solution to the inequality given.

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Most popular questions from this chapter

A rectangular quilt is to be made so that the length is 1.2 times the width. The quilt must be between \(72 \mathrm{ft}^{2}\) and \(96 \mathrm{ft}^{2}\) to cover the bed. Determine the restrictions on the width so that the dimensions of the quilt will meet the required area. Give exact values and the approximated values to the nearest tenth of a foot.

The procedure to solve a polynomial or rational inequality may be applied to all inequalities of the form \(f(x)>0, f(x)<0,\) \(f(x) \geq 0,\) and \(f(x) \leq 0 .\) That is, find the real solutions to the related equation and determine restricted values of \(x .\) Then determine the sign of \(f(x)\) on each interval defined by the boundary points. Use this process to solve the inequalities. $$ \left|x^{2}-4\right|<5 $$

A landscaping team plans to build a rectangular garden that is between \(480 \mathrm{yd}^{2}\) and \(720 \mathrm{yd}^{2}\) in area. For aesthetic reasons, they also want the length to be 1.5 times the width. Determine the restrictions on the width so that the dimensions of the garden will meet the required area. Give exact values and the approximated values to the nearest tenth of a yard.

For a certain stretch of road, the distance \(d\) (in \(\mathrm{ft}\) ) required to stop a car that is traveling at speed \(y\) (in mph) before the brakes are applied can be approximated by \(d(v)=0.06 v^{2}+2 v .\) Find the speeds for which the car can be stopped within \(250 \mathrm{ft}\).

The procedure to solve a polynomial or rational inequality may be applied to all inequalities of the form \(f(x)>0, f(x)<0,\) \(f(x) \geq 0,\) and \(f(x) \leq 0 .\) That is, find the real solutions to the related equation and determine restricted values of \(x .\) Then determine the sign of \(f(x)\) on each interval defined by the boundary points. Use this process to solve the inequalities. $$ \sqrt{2 x-6}-2<0 $$

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