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Other exercises on quadratic functions: https://www.problemasydesafiosmatemat... --- Comments on the video --- Exercise on quadratic functions solved using a completely algebraic method. To find the equation of the parabola, I use the vertex formula of a quadratic function, dispensing with the use of derivatives as this is a 4th year high school exercise. Note: It could also have been solved using movements of the elementary parabolic function f(x) = x².