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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.
To find the roots (solutions) of a quadratic equation.
I suggest you use the quadratic formula.
For any quadratic ax2 + bx + c = 0 we can find x by using the quadratic formulae: the quadratic formula is... [-b +- sqrt(b2 - 4(a)(c)) ] / 2a
Among the websites that have a quadratic formula calculator is the MathWarehouse. Others are the websites CoolMath, RapidTables, MathDefined, and MathIsFun.