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"In elementary algebra, a quadratic equation (from the Latin quadratus for "square") is any equation having the form
ax^2+bx+c=0
where x represents an unknown, and a, b, and c are constants with a not equal to 0. If a = 0, then the equation is linear, not quadratic. The constants a, b, and c are called, 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 a process known in American English as factoring and in other varieties of English as factorising, by completing the square, by using the quadratic formula, or by graphing." [Quadratic equation. Wikipedia]
The flowchart example "Solving quadratic equation algorithm" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Mathematics solution from the Science and Education area of ConceptDraw Solution Park.
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## How to Diagram Sentences

Diagramming sentences is a playful, fun way of learning English Grammer. Sentences can be very complex and can contain many different parts of speech which implicate many different grammatical rules. Diagramming sentences will help you to make sure every part of your sentence are grammatically correct and provides you with a more comprehensive understanding of the English Language. A Sentence Diagram displays the parts of a sentence as a diagram in order to show the relationship of words and groups of words within the sentence. Sentence Diagram shows the relationship between the proposal of its parts. This is a good way to teach grammar! Sentence Diagram helps to make the writing more coherent as well as more interesting to read. ConceptDraw DIAGRAM allows you to create clear sentence diagrams using the special templates and vector stencils library.