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In my opinion the best formula for solving quadratic equations is by using the quadratic formula.
A quadratic equation must include ax^2 + bx + c = 0
ax^2 being the quadratic bx being the linear term and c being the constant term.
Using different strategies depend on the equation if it’s setup easy to factor, then I would factor, other than that I find the quadratic formula the easiest.
If you cut a pizza in half and keep cutting the half you will never run out of pizza as the halfs keep getting smaller reaching a constant. It will never reach 0 as it has a finite sum.