Con una cuerda de 20m de longitud se ha formado un rectángulo de 21m². ¿Cuáles son las dimensiones del rectángulo? Resolver usando ecuaciones de 2° grado.​

Which statement is true about the extreme value of the given quadratic equation? a. the equation has a maximum value with a y-coordinate of -21. b. the equation has a maximum value with a y-coordinate of -27. c. the equation has a minimum value with a y-coordinate of -21. d. the equation has a minimum value with a y-coordinate of -27.