I found an answer from en.wikipedia.org

**Quadratic equation** - Wikipedia

In algebra, a **quadratic equation** is any equation having the form. a x 2 + b x + c =
0 , {\displaystyle ax^{2}+bx+c=0,} {\displaystyle ax^{2}+bx+c=0,}. where x ...

For more information, see **Quadratic equation** - Wikipedia

I found an answer from www.quora.com

What is meant by a **quadratic equation**? - Quora

A **quadratic equation** is a function where the leading term comprises of an x
^2 term. Compare this with a linear function, where the leading term is of ...

For more information, see What is meant by a **quadratic equation**? - Quora

I found an answer from en.wikipedia.org

**Quadratic formula** - Wikipedia

In elementary algebra, the **quadratic formula** is the solution of the **quadratic**
**equation**. There are other ways to solve the **quadratic equation** instead of using
the ...

For more information, see **Quadratic formula** - Wikipedia

I found an answer from www.britannica.com

**Quadratic equation** | mathematics | Britannica.com

**Quadratic equation**, in mathematics, an algebraic equation of the second degree
(having one or more variables raised to the second power). Old Babylonian ...

For more information, see **Quadratic equation** | mathematics | Britannica.com

I found an answer from mathworld.wolfram.com

**Quadratic Equation** -- from Wolfram MathWorld

The Greeks were able to solve the **quadratic equation** by geometric methods, and
Euclid's (ca. 325-270 BC) Data contains three problems involving quadratics.

For more information, see **Quadratic Equation** -- from Wolfram MathWorld

I found an answer from mathworld.wolfram.com

**Quadratic Formula** -- from Wolfram MathWorld

The formula giving the roots of a **quadratic equation** ... From MathWorld--A
Wolfram Web Resource. http://mathworld.wolfram.com/QuadraticFormula.html ...

For more information, see **Quadratic Formula** -- from Wolfram MathWorld

I found an answer from www.quora.com

What is the main purpose of the **quadratic formula**? - Quora

Well, there are none. It basically appears almost everywhere in different form, for example in biology, in economy, physics, can be useful to know how to solve ...

For more information, see What is the main purpose of the **quadratic formula**? - Quora