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You remember this one, don't you. Opposite of b, plus or minus. Well instead just telling you, why we derive the formula.
It does not account for cases where the discriminant is less than 0. How to factor anything with x squared in it. This video looks at solving quadratic equations by graphing.
This example shows how to make a quadratic formula caluclator. The vertex formula is used to determine of a parabola when quadratic function written in general form instead standard form. Problems come from kutasoftware worksheet "using quadratic formula" but i use factoring if can.