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a - b = 6 , abmin = ??
a = 6+b
P = (6+b)b
P = 6b + b² , para que el producto sea minimo, se debe derivar, entonces
dP´ = 0 = 6 + 2b ---------> b = -3 , ----> a = 3
entonces:
Pmin = (3)*(-3) = -9