It means that in a complex equation, when X and Y take two different real numbers respectively, the solution of the equation is the same real number, that is, the values of X and Y are equal. This usually happens when the discriminant of a complex equation is zero.
That is delta = b? -4ac=0, where a, b and c are the coefficients in the equation respectively. When δ = 0, the equation has two equal real roots.
Brief introduction of one-dimensional linear equation;
One-dimensional linear equation refers to an equation with only one unknown number, the highest order of which is 1, and both sides are algebraic expressions. A linear equation with one variable has only one root.
One-dimensional linear equation can solve most engineering problems, travel problems, distribution problems, profit and loss problem, integral table problems, telephone billing problems and digital problems. One-dimensional linear equations were first seen in ancient Egypt around 1600 BC.
Around 820 AD, the mathematician Hua La Zi Mi put forward the idea of "merging items" and "shifting items" in his book "Eliminating Yuan and Reducing Yuan".
In16th century, after the mathematician David founded symbolic algebra, he put forward the propositions of shifting terms and division of the same equation. 1859, mathematician Li officially translated this kind of equations into linear equations.
About 1650 BC, the 24th question was recorded in the rhind papyrus scroll of ancient Egypt, and the title was: "A quantity, plus it equals 19, find this quantity." Solve a linear equation, that is, use a single hypothesis to solve the problem.
Around 1 century BC, China people first added negative numbers to the arithmetic of nine chapters, put forward the arithmetic of positive and negative numbers, and solved the problem of shifting terms. In the chapter of "insufficient profit", the skills of insufficient profit are put forward. However, this method has not been used to solve one-dimensional linear equations. 1 1 to1was introduced into Arabia in the 3rd century, which was called "Khitan algorithm".
In the 9th century A.D., Arab mathematician Hua Lazimi gave a simple and feasible basic method to understand the equations in Elimination and Reduction, namely reduction and elimination. But no alphabetic symbols are used. It embodies the obvious idea of the equation.
/kloc-In the 20th century, the Indian mathematician Bashgaro solved a class of linear equations by assuming (setting unknowns). Since the assumed number can be any positive number, Pashgaro calls the above method "any number algorithm".
/kloc-in the 3rd century, China's complementary technique was introduced to Europe, and the Italian mathematician Fibonacci used single hypothesis and double hypothesis to solve linear equations in his book Calculation.
/kloc-in the 6th century, after David founded symbolic algebra, he put forward the propositions of shifting terms and dividing equations, and also created this concept, which was regarded as the father of modern mathematics. But Vida doesn't accept negative numbers.