rd sharma class 10 solutions chapter 8 Quadratic Equations Ex 8.1 Q5

## rd sharma class 10 solutions chapter 8 Quadratic Equations Ex 8.1 Q5

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This article is about single-variable quadratic equations and their solutions. For more general information about the single-variable case, see Quadratic function. For the case of more than one variable, see Quadric.

In elementary algebra, a **quadratic equation** (from the Latin *quadratus* for “square“) is any equation having the form

where *x* represents an unknown, and *a*, *b*, and *c* represent numbers such that *a* is not equal to 0. If *a* = 0, then the equation is linear, not quadratic. The numbers *a*, *b*, and *c* are the *coefficients* of the equation, and may be distinguished by calling them, respectively, the*quadratic coefficient*, the *linear coefficient* and the *constant* or *free term.*

Because the quadratic equation involves only one unknown, it is called “univariate“. The quadratic equation only contains powers of *x* that are non-negative integers, and therefore it is a polynomial equation, and in particular it is a second degree polynomial equation since the greatest power is two.

Quadratic equations can be solved by factoring, by completing the square, by using the quadratic formula, or by graphing. Solutions to problems equivalent to the quadratic equation were known as early as 2000 BC

A quadratic equation with real or complex coefficients has two solutions, called *roots*. These two solutions may or may not be distinct, and they may or may not be real.

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