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CAT Solving inequalities using number line - Practice Questions & MCQ

Edited By admin | Updated on Oct 04, 2023 04:20 PM | #CAT

Quick Facts

  • 4 Questions around this concept.

Solve by difficulty

Which values of x satisfy the inequality (x + 1)(x - 3) < 0? 

Solution of the inequality \:\left(x\:+\:1\right)\left(x\:-\:2\right)\left(x+7\right)\:<\:0 is

Solution of (x+1)(x-2)\geq 0 

Concepts Covered - 1

Solving inequalities using number line
  1. Introduction

  • Definition of Inequalities
  • Key elements of inequalities
  • Representation of inequalities using number line

 

2. Solving Inequalities using Number Line

  • Step by step method for solving inequalities using number line
  • Example using previous year questions:
  • Question: Solve the inequality \mathrm{3x + 4 > 10}
  • Solution:
    • Step 1: Subtract 4 from both sides of the inequality. \mathrm{3x > 6}
    • Step 2: Divide both sides by \mathrm{3. x > 2}
    • Step 3: Represent the solution on the number line.

3. Tips and Tricks

  • Tip 1: Be careful while performing operations on both sides of the inequality. The direction of the inequality may change.
  • Tip 2: Remember to flip the inequality sign when multiplying or dividing by a negative number.
  • Tip 3: Use the number line to visualise the solution and identify the valid range.

4. Common Mistakes to Avoid

  • Mistake 1: Forgetting to flip the inequality sign when multiplying or dividing by a negative number.
  • Mistake 2: Confusing the direction of the inequality while performing operations on both sides.
  • Mistake 3: Misinterpreting the solution on the number line.

5. Practice Questions

  • Question 1: Solve the inequality \mathrm{2x - 5 \leq 9}
  • Question 2: Solve the inequality \mathrm{3(2 - x) > 8 - 2x}

6. Key Takeaways

  • Understanding and solving inequalities using the number line
  • Applying the steps to solve inequalities in management entrance exam questions

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