Question 1

What is the quadratic formula?

Accepted Answer

The quadratic formula is x = (-b ± √(b² - 4ac)) / 2a. It solves any quadratic equation of the form ax² + bx + c = 0. Enter a, b, and c to get the solutions instantly.

Question 2

How do I calculate compound interest?

Accepted Answer

Compound interest is calculated with A = P(1 + r/n)^(nt), where P is principal, r is annual rate, n is compounds per year, and t is years. Use our calculator to find the final amount instantly.

Question 3

How do I find the area of a circle?

Accepted Answer

The area of a circle is A = πr². Simply enter the radius and the calculator gives you the exact area, shown in terms of π when possible.

Question 4

What is the Pythagorean theorem?

Accepted Answer

The Pythagorean theorem states c = √(a² + b²) for right triangles, where c is the hypotenuse. Enter the two sides to calculate the hypotenuse.

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