Doctors use them somehow which you don't need to know.
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You convert the equation to the form: ax2 + bx + c = 0, replace the numeric values (a, b, c) in the quadratic formula, and calculate.
By knowing how to use the quadratic equation formula.
All you do is set the quadratic function to equal to 0. Then you can either factor or use the quadratic formula to solve for your unknown variable.
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.