The Islamic Empire established across Persia, the Middle East, Central Asia, North Africa, Iberia and parts of India from the 8th Century onwards made significant contributions towards mathematics. They were able to draw on and fuse together the mathematical developments of both Greece cubic roots and Cardano formula India. One consequence of the Islamic prohibition on depicting the human form was the extensive use of complex geometric patterns to decorate their buildings, raising mathematics to the form of an art. In fact, over time, Muslim artists discovered all the different forms of symmetry that can be depicted on a 2-dimensional surface.
Golden Age of Islamic science and mathematics flourished throughout the medieval period from the 9th to 15th Centuries. The House of Wisdom was set up in Baghdad around 810, and work started almost immediately on translating the major Greek and Indian mathematical and astronomy works into Arabic. The outstanding Persian mathematician Muhammad Al-Khwarizmi was an early Director of the House of Wisdom in the 9th Century, and one of the greatest of early Muslim mathematicians. The 10th Century Persian mathematician Muhammad Al-Karaji worked to extend algebra still further, freeing it from its geometrical heritage, and introduced the theory of algebraic calculus. Al-Karaji was the first to use the method of proof by mathematical induction to prove his results, by proving that the first statement in an infinite sequence of statements is true, and then proving that, if any one statement in the sequence is true, then so is the next one. Among other things, Al-Karaji used mathematical induction to prove the binomial theorem. Indian methods for extracting square and cube roots to include fourth, fifth and higher roots in the early 12th Century.
He carried out a systematic analysis of cubic problems, revealing there were actually several different sorts of cubic equations. The 13th Century Persian astronomer, scientist and mathematician Nasir Al-Din Al-Tusi was perhaps the first to treat trigonometry as a separate mathematical discipline, distinct from astronomy. With the stifling influence of the Turkish Ottoman Empire from the 14th or 15th Century onwards, Islamic mathematics stagnated, and further developments moved to Europe. However, Cardano was not the original discoverer of either of these results. The hint for the cubic had been provided by Niccolò Tartaglia, while the quartic had been solved by Ludovico Ferrari. However, Tartaglia himself had probably caught wind of the solution from another source.
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Birkhoff and Mac Lane 1996, p. Birkhoff and Mac Lane 1996, pp. Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing. CRC Standard Mathematical Tables, 28th ed. Boca Raton, FL: CRC Press, pp. A Survey of Modern Algebra, 5th ed.
1b in Polynomials and Polynomial Inequalities. A History of Mathematics, 2nd ed. A New Solution of the Cubic Equation. Cardano and the Solution of the Cubic.
6 in Journey through Genius: The Great Theorems of Mathematics. 16 in Fundamental Concepts of Abstract Algebra. A Geometric Interpretation of the Solution of the General Quartic Polynomial. Omar Khayyám and a Geometric Solution of the Cubic. A Note on the Roots of a Cubic. Various Ways to Tackle Algebraic Equations with Mathematica.
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6 in Numerical Recipes in FORTRAN: The Art of Scientific Computing, 2nd ed. Cambridge, England: Cambridge University Press, pp. 17 in An Atlas of Functions. 62 in The Calculus of Observations: A Treatise on Numerical Mathematics, 4th ed. 1 tool for creating Demonstrations and anything technical.
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However, the method for solving cubics has actually existed for centuries! Discovered in the 1500s by Italian mathematicians Niccolò Tartaglia and Gerolamo Cardano, the method for solving cubics was one of the first formulas not known to the ancient Greeks and Romans. Check whether your cubic contains a constant. If it doesn’t, you can use the quadratic equation to find the answers to the equation after a little mathematical legwork. If, on the other hand, your equation does contain a constant, you’ll need to use another solving method. Use the quadratic formula to solve the portion in parentheses. Do this to find two of the answers to you cubic equation.
Use zero and the quadratic answers as your cubic’s answers. While quadratic equations have two solutions, cubics have three. You already have two of these — they’re the answers you found to the “quadratic” portion of the problem in parentheses. Congratulations — you’ve just solved your cubic. The reason this works has to do with the fundamental fact that any number times zero equals zero.
If either of these “halves” equals zero, the entire equation will. Ensure your cubic has a constant. While the method described above is convenient because you don’t have to learn any new mathematical skills to use it, it won’t always be able to help you solve cubics. As a quick reminder, factors are the numbers that can multiply together to make another number. This will usually result in lots of fractions and a few whole numbers.
The integer solutions to your cubic equation will either be one of the whole numbers in this list or the negative of one of these numbers. Our cubic equation’s integer solutions are somewhere in this list. Use synthetic division or check your answers manually. Once you have your list of values, you can find the integer answers to your cubic equation by quickly plugging each integer in manually and finding which ones equal zero. Synthetic division is a complex topic — see the link above for more information.
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For this method of finding a cubic equation’s solutions, we’ll be dealing heavily with the coefficients of the terms in our equation. The discriminant approach to finding a cubic equation’s solution requires some complicated math, but if you follow the process carefully, you’ll find that it’s an invaluable tool for figuring out those cubic equations that are hard to crack any other way. The next important quantity we’ll need, Δ1, requires a little more work, but is found in essentially the same way as Δ0. 27a2d to get your value for Δ1. Next, we’ll calculate the discriminant of the cubic from the values of Δ0 and Δ1.
The last important value we need to calculate is C. This important quantity will allow us to finally find our three roots. Solve as normal, substituting Δ1 and Δ0 as needed. Calculate the three roots with your variables. 2 and n is either 1, 2, or 3.
Plug in your values as needed to solve — this requires lots of mathematical legwork, but you should receive three viable answers! That equation has numerous answers because you’ve got three variables. To get one answer for three variables you need three equations. The question is: if 3 consecutive even numbers are multiplied and the result would be 960. What are those numbers and how did you did with the step? Solve the equation using the discriminant approach you will get three values of x.
Easy from here, you pick the real value of x, that’s 8 and your three numbers were 8, 10 and 12. Can you give a particular formula for solving cubic equations? How can there be a square root of -3? In the ordinary sense, there is no such thing as the square root of a negative number. However, mathematicians have invented the “imaginary” number known as “i”, which is defined as the square root of negative 1. The square root of -3 is equal to “i” multiplied by the square root of 3, or 1.
What’s the product of Alpha Beta Gamma Delta if they are the roots of the polynomial? It is the constant term of the polynomial. WLOG let the equation give r. 0 and it’s a denominator in the final equation, its also a coefficient.
Include your email address to get a message when this question is answered. To solve a cubic equation, start by determining if your equation has a constant. If it doesn’t, use the quadratic formula to solve it. If it does have a constant, you won’t be able to use the quadratic formula. Instead, find all of the factors of a and d in the equation and then divide the factors of a by the factors of d.