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X +Y = 42
X.Y = 405
De la primera tenemos que Y= 42-X, sustituyendo este valor en la segunda tenemos:
X(42-X)=405
42X -X² = 405
X²-42X -405=0
X= 42+-√42² - 4.405/2 = 42+- √1764 - 1620/2 = 42+-√144/2 = 42+-12/2
X₁=42+12/2 = 54/2=27
X₂= 42 - 12 = 30/2 = 30
Los números pedidos serán 27 y 30