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Grade (bouldering)

Bouldering also has a number of grading systems: Hueco[?] V grades, Fontainebleau technical grades and route colours and overall difficulty grades, Peak District B grades, British technical grades.

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Quadratic formula

... the square of b/(2a) to both sides, getting <math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math> The left side is now a perfect ...