Inequality Solver Calculator
Solve linear and quadratic inequalities and get interval notation solutions.
Enter Inequality
ax + b < c
Solution
Inequality
2x -5 < 3
Solution
x < 4
Interval Notation
(-∞, 4)
How to Solve Inequalities
Linear Inequalities
- • Isolate the variable on one side
- • When multiplying/dividing by negative, flip the sign
- • Express solution in interval notation
Quadratic Inequalities
- • Find the roots of the equation
- • Test intervals between and outside roots
- • Consider if parabola opens up or down
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Handbook of Mathematical Functions
by Abramowitz & Stegun
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.