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Basic Math

Because doing this all by hand is for people living before computers were awesome.

Given

$$ax^2+bx+c=0$$

solve for x : $$x = \frac {-b \pm \sqrt {b^2 - 4ac}}{2a}$$

OR

Distance Formula

Given two points $$(x_1,y_1)$$ and $$(x_2,y_2)$$

solve for distance between them :
$$\sqrt{(x_1 - x_2)^2 + (y_1 - y_2)^2}$$

Common Factors

Greatest Common Denominator (GCD) and Least Common Multiple (LCM)

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