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Figure 1. Plots of quadratic function y = ax 2 + bx + c, varying each coefficient separately while the other coefficients are fixed (at values a = 1, b = 0, c = 0). A quadratic equation whose coefficients are real numbers can have either zero, one, or two distinct real-valued solutions, also called roots.
In elementary algebra, the quadratic formula is a closed-form expression describing the solutions of a quadratic equation. Other ways of solving quadratic equations, such as completing the square , yield the same solutions.
The graph of a real single-variable quadratic function is a parabola. If a quadratic function is equated with zero, then the result is a quadratic equation. The solutions of a quadratic equation are the zeros (or roots) of the corresponding quadratic function, of which there can be two, one, or zero. The solutions are described by the quadratic ...
The quadratic equation on a number can be solved using the well-known quadratic formula, which can be derived by completing the square. That formula always gives the roots of the quadratic equation, but the solutions are expressed in a form that often involves a quadratic irrational number, which is an algebraic fraction that can be evaluated ...
This quadratic equation has two solutions: = and = But if 0 {\displaystyle 0} is substituted for x {\displaystyle x} in the original equation, the result is the invalid equation 2 = 0 {\displaystyle 2=0} .
Equation is a quadratic equation for u. Its solution is = ... is always real, which ensures that the two quadratic equations have real coefficients. [5]
All quadratic equations have exactly two solutions in complex numbers (but they may be equal to each other), a category that includes real numbers, imaginary numbers, and sums of real and imaginary numbers. Complex numbers first arise in the teaching of quadratic equations and the quadratic formula. For example, the quadratic equation
The solutions to the quadratic equation ax 2 + bx + c = 0 are − b ± b 2 − 4 a c 2 a . {\displaystyle {\frac {-b\pm {\sqrt {b^{2}-4ac}}}{2a}}.} Thus quadratic irrationals are precisely those real numbers in this form that are not rational.
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