The quadratic equation in standard form is: ax2 + bx + c = 0.
The solution is x = [-b ± √b2- 4ac)] ÷ 2a
You can use either plus or minus - a quadratic equation may have two solutions.
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There are an infinite number of different quadratic equations. The quadratic formula is a single formula that can be used to find the pair of solutions to every quadratic equation.
A quadratic equation normally has 2 solutions and can be solved by using the quadratic equation formula.
By using the quadratic equation formula
By using the quadratic equation formula or by completing the square
The discriminant