Learning focus 1
Type both sides with <, >, ≤, or ≥.
Free online calculator
Inequality Calculator
Solve linear and quadratic inequalities and express the real solution set in clear interval notation.
Step-by-step solutions
Clear, detailed explanations
Instant results
Accurate answers in seconds
Free to use
No sign-up required
How to Use the Inequality Calculator
1
Enter the inequality
Type both sides with <, >, ≤, or ≥.
2
Find boundary points
The calculator solves the related equation and tests each interval.
3
Read the solution set
Get the final answer in interval notation with endpoints handled correctly.
Example
Learn This Topic
What the Inequality Calculator Helps You Understand
Solve linear and quadratic inequalities and express the real solution set in clear interval notation.
Learning focus 2
The calculator solves the related equation and tests each interval.
Learning focus 3
Get the final answer in interval notation with endpoints handled correctly.
Input tips
- • Type both sides with <, >, ≤, or ≥.
- • Yes. It finds the real roots, checks the sign between them, and includes endpoints for ≤ or ≥.
Common mistakes to avoid
- • Forgetting to reverse the inequality after multiplying or dividing by a negative number.
- • Including an endpoint when the inequality is strict.
Frequently Asked Questions
Does it solve quadratic inequalities?
Yes. It finds the real roots, checks the sign between them, and includes endpoints for ≤ or ≥.
What does union mean in the answer?
A union joins separate intervals that both satisfy the inequality.