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# How do you use the Quadratic Formula to solve an equation?

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How do you use the Quadratic Formula to solve an equation?

Guest Jun 5, 2017
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Substitute numbers in it and you get the solution, for any solvable quadratic equation :)

$$\underline{\text{Quadratic Formula}}\\ \text{For any quadratic equation } ax^2 + bx + c = 0\\ \text{The solutions for x are } \dfrac{-b+\sqrt{b^2-4ac}}{2a}\text{ or }\dfrac{-b-\sqrt{b^2-4ac}}{2a}$$

If you see any negative numbers in it:

$$x^2 - 7x + 6$$<--- like this one

Turn it into: $$x^2 + (-7)x + 6$$ <-- that way it will be exact same as the general form and you can substitute numbers :D

MaxWong  Jun 6, 2017
edited by MaxWong  Jun 6, 2017