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1
The value of roots
$$x = \dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$$
2
Sum of the roots
$$\dfrac{-b}{a}$$
3
Product of the roots
$$\dfrac{c}{a}$$
4
The minimum value of the quadratic equation is
$$\dfrac{4ac - b^2}{4a}$$ when a > 0
5
The maximum value of the quadratic equation is
$$\dfrac{4ac - b^2}{4a}$$ when a < 0
6
The min/max value of the quadratic equation occurs at
$$ x = \dfrac{-b}{2a}$$
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