The quadratic formula is
x=-b (+or-) square root of b2-4ac all over 2a
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A quadratic equation can have either two real solutions or no real solutions.
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.
To find the roots (solutions) of a quadratic equation.
I suggest you use the quadratic formula.
A quadratic equation normally has 2 solutions and can be solved by using the quadratic equation formula.