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Quadratic Formula

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I find that having the (-) on the x2 can sometimes make the quadratic formula confusing, as having the correct sign on the a,b, and c values is critical to get the correct answer. Multiply the whole equation by -1 and give the quadratic equation another shot!
The discriminant: b- 4*a*c is also a very helpful tool for solving polynomials.
Hope this helps!