When you need to find the roots of a quadratic equation and factorisation does not work (or you cannot find the factors). The quadratic equation ALWAYS works. And when appropriate, it will give the imaginary roots which, judging by this question, you may not yet be ready for.
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you use the quadratic formula in math when the quadratic equation you are solving cannot be factored.
The quadratic formula is used to solve the quadratic equation. Many equations in which the variable is squared can be written as a quadratic equation, and then solved with the quadratic formula.
aryabhatt's quadratic formula
True
Because it's part of the quadratic equation formula in finding the roots of a quadratic equation.