What is the quadratic formula?

x = (−b ± √(b² − 4ac)) / 2a. It solves any quadratic equation ax² + bx + c = 0 where a ≠ 0.

What does the discriminant tell me?

The discriminant is b² − 4ac. If positive, there are two real roots. If zero, one repeated real root. If negative, two complex roots.

Solve any quadratic equation ax² + bx + c = 0. Shows both roots, the discriminant, and step-by-step working.

ax² + bx + c = 0

a (coefficient of x²)

b (coefficient of x)

c (constant)

Calculate percentages, percentage of a number, and percentage change between two values.

Add, subtract, multiply, and divide fractions. Results are automatically simplified to lowest terms.

Calculate the average (mean) of any set of numbers. Also shows sum, count, min, and max.

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