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b * h = 300
El perímetro es igual a:
2b + 2h = 70
b + h = 35 => b = 35 - h
Sustituimos en el área:
(35 - h) h = 300
35 h - h² = 300
Ahora ordenamos: h² - 35h + 300 = 0
Factorizamos (h - 20) (h - 15) = 0
Y las dimensiones son:
Largo = 20 m
Ancho = 15 m
Espero te sirva!