the entire quadratic formula is x is equal to negative b plus or minus the square root b squared minus four(4) a c all over two(2) a (divided by 2)
you may have trouble remembering this formula but you can fit it to the tune of pop goes the weasle.
here ya go
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This formula is called the quadratic formula.
The quadratic formula is derived by completing the square. That is as much as I can tell you.
In general, quadratic equations have graphs that are parabolas. The quadratic formula tells us how to find the roots of a quadratic equations. If those roots are real, they are the x intercepts of the parabola.
The quadratic formula can be derived by used a method called completing the square. It's like using algebra to solve for x. The process is explained the related link "Derivation of Quadratic Formula".
A quadratic equation.