Beef jerky is essentially beef that's been cut into strips, marinated[?], and dried (originally in the sun). The result is a strip of rather salty beef that can be stored for long periods of time, similar to pemmican.
In more recent times beef jerky has evolved into a snack-food, typically in the shape of a long rod, and heavily spiced.
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Quadratic formula
The quadratic formula expresses the explicit solution(s) x to the quadratic equation
<math>ax^2+bx+c=0</math>
in terms of ...