The discriminant of the quadratic equation is D = b 2 - 4ac.The quadratic equation in its standard form is ax 2 + bx + c = 0.The following list of important formulas is helpful to solve quadratic equations. If α, β, are the roots of the quadratic equation, then the quadratic equation is as follows. The quadratic equation can also be formed for the given roots of the equation. Product of the Roots: αβ = c/a = Constant term/ Coefficient of x 2.Sum of the Roots: α + β = -b/a = - Coefficient of x/ Coefficient of x 2.For a quadratic equation ax 2 + bx + c = 0, the sum and product of the roots are as follows. The product of the root of the equation is equal to the constant term divided by the coefficient of the x 2. The sum of the roots of the quadratic equation is equal to the negative of the coefficient of x divided by the coefficient of x 2. The sum and product of roots of a quadratic equation can be directly calculated from the equation, without actually finding the roots of the quadratic equation. The coefficient of x 2, x term, and the constant term of the quadratic equation ax 2 + bx + c = 0 are useful in determining the sum and product of the roots of the quadratic equation. Sum and Product of Roots of Quadratic Equation D Based on the discriminant value the nature of the roots of the quadratic equation can be predicted. The value b 2 - 4ac is called the discriminant of a quadratic equation and is designated as 'D'. This is possible by taking the discriminant value, which is part of the formula to solve the quadratic equation. The nature of roots of a quadratic equation can be found without actually finding the roots (α, β) of the equation. And also check out the formulas to find the sum and the product of the roots of the equation.
QUADRATIC FORMULA EQUATION HOW TO
Here we shall learn more about how to find the nature of roots of a quadratic equation without actually finding the roots of the equation. The roots of a quadratic equation are usually represented to by the symbols alpha (α), and beta (β). Thus, by completing the squares, we were able to isolate x and obtain the two roots of the equation.
This is good for us, because now we can take square roots to obtain: The left hand side is now a perfect square: Now, we express the left-hand side as a perfect square, by introducing a new term (b/2a) 2 on both sides: To determine the roots of this equation, we proceed as follows: Quadratic Formula ProofĬonsider an arbitrary quadratic equation: ax 2 + bx + c = 0, a ≠ 0 Quadratic Formula: The roots of a quadratic equation ax 2 + bx + c = 0 are given by x = /2a.Įxample: Let us find the roots of the same equation that was mentioned in the earlier section x 2 - 3x - 4 = 0 using the quadratic formula. The positive sign and the negative sign can be alternatively used to obtain the two distinct roots of the equation.
The two roots in the quadratic formula are presented as a single expression. The roots of the quadratic equation further help to find the sum of the roots and the product of the roots of the quadratic equation. There are certain quadratic equations that cannot be easily factorized, and here we can conveniently use this quadratic formula to find the roots in the quickest possible way. Quadratic Formula is the simplest way to find the roots of a quadratic equation. Maximum and Minimum Value of Quadratic Expression Nature of Roots of the Quadratic Equation We shall learn more about the roots of a quadratic equation in the below content. These two answers for x are also called the roots of the quadratic equations and are designated as (α, β). The quadratic equations are second-degree equations in x that have a maximum of two answers for x. Did you know that when a rocket is launched, its path is described by a quadratic equation? Further, a quadratic equation has numerous applications in physics, engineering, astronomy, etc. In other words, a quadratic equation is an “equation of degree 2.” There are many scenarios where a quadratic equation is used. The word "Quadratic" is derived from the word "Quad" which means square. Quadratic equations are second-degree algebraic expressions and are of the form ax 2 + bx + c = 0.
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