Math Problem Statement

Déterminer l'ensemble des solutions sur ℝ de : e^(5x+1) > e^(-4x+3)

Solution

The inequality given is:

e5x+1>e4x+3e^{5x+1} > e^{-4x+3}

To solve this inequality, we can start by simplifying it by taking the natural logarithm on both sides. Since the exponential function exe^x is strictly increasing, applying the natural logarithm will maintain the inequality.

Step 1: Apply the natural logarithm (ln) to both sides:

ln(e5x+1)>ln(e4x+3)\ln(e^{5x+1}) > \ln(e^{-4x+3})

This simplifies to: 5x+1>4x+35x + 1 > -4x + 3

Step 2: Solve the resulting inequality

Now, solve for xx:

  1. Add 4x4x to both sides: 5x+4x+1>35x + 4x + 1 > 3 9x+1>39x + 1 > 3

  2. Subtract 1 from both sides: 9x>29x > 2

  3. Divide both sides by 9: x>29x > \frac{2}{9}

Step 3: Express the solution

The solution set for xx is:

x(29,+)x \in \left( \frac{2}{9}, +\infty \right)

Thus, the solution set is (29,+)\left( \frac{2}{9}, +\infty \right).

Would you like a further breakdown of any steps?

5 related questions:

  1. How do you solve inequalities involving logarithmic functions?
  2. What are the properties of the natural logarithm used in solving exponential inequalities?
  3. Can an exponential inequality have no solution? Under what conditions?
  4. How would the inequality change if one side were a different base, such as 25x+1>34x+32^{5x+1} > 3^{-4x+3}?
  5. What are the implications of solving inequalities over the real numbers R\mathbb{R} versus other number sets?

Tip: When solving exponential inequalities, applying the natural logarithm is a powerful method because it linearizes the exponents, making the inequality much easier to solve.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Exponential Functions
Inequalities
Logarithms

Formulas

Exponential function: e^x
Natural logarithm: ln(x)

Theorems

Properties of logarithms: ln(e^x) = x
Rules for solving inequalities

Suitable Grade Level

Grades 10-12