###### Asked in Math and ArithmeticAlgebraGeometry

Math and Arithmetic

Algebra

Geometry

# What is a quadratic equation?

## Answer

###### Wiki User

###### January 24, 2011 8:37PM

A quadratic equation is an equation where a quadratic polynomial is equal to zero. It can be written as ax^2+bx+c=0 where a,b,c are the coefficients and x is the variable. A quadratic equation has always two complex solutions for x given by the formula x=-b/2a+sqrt(b^2-4ac)/2a and x=-b/2a-sqrt(b^2-4ac)/2a. Examples of quadratic equations are x^2+x-2=0, 5x^2+6x=0, x^2+1=0 etc.

## Related Questions

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### What is equadtratic equation?

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### Does the equation a2 plus b2 equals c2 classify as a quadratic equation?

A quadratic equation is univariate: it has only one variable. A
quadratic equation cannot have two variables. So, if b and c are
known then it is a quadratic equation in a; if a and b are known it
is a quadratic in c.
Another Answer:-
The question given is Pythagoras' theorem formula for a right
angle triangle