Well we know about quadratic equations, but quad means four, but quadratic equations have two roots. So why is it so?
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You surely wanted to ask for quadratic equations? or set theory? – pooja somani Oct 25 '18 at 17:47
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Quadratic equations – Shamim Akhtar Oct 25 '18 at 17:48
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then y does heading asks about set A? – pooja somani Oct 25 '18 at 17:48
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Ooh sorry i forgot to change that – Shamim Akhtar Oct 25 '18 at 17:49
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A quadratic equation contains a square. Quadratus is Latin for square. – Angina Seng Oct 25 '18 at 17:50
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Please upvote the question – Shamim Akhtar Oct 25 '18 at 17:50
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2@ShanimAkhtar That's not how voting works. – Arthur Oct 25 '18 at 17:57
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This is what mathworld says about quadratic equations.
The Latin prefix quadri- is used to indicate the number 4, for example, quadrilateral, quadrant, etc. However, it also very commonly used to denote objects involving the number 2. This is the case because quadratum is the Latin word for square, and since the area of a square of side length x is given by $x^2$, a polynomial equation having exponent two is known as a quadratic ("square-like") equation. By extension, a quadratic surface is a second-order algebraic surface.
By analogy, since the volume of a cube of side length x is $x^3$, a polynomial equation having exponent three is called a cubic equation. An equation of degree four is then unimaginatively called a quartic equation, or sometimes (more commonly in older sources) a biquadratic equation.
pooja somani
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