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f(4) = (4)^2 -2(4) = 16 - 8 = 8
y del mismo modo encontramos f(4 + h)
f(4 + h) = (4 + h)^2 - 2(4 + h)
= 16 + 8h + h^2 - 8 - 2h = h^2 + 6h + 8