Dominios Funciones.pdf

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CÁLCULO DE DOMINIOS 1 Ejercicios.- Calcula el dominio de cada una de las siguientes funciones: a)

f ( x) = log(3 x + 5)

f ( x) =

h)

f ( x) = 3

i)

f ( x) = e

j)

f ( x) = log( x 2 − 2 x − 3)

x 2 − 5x + 6 x 2 − 7 x + 12

b)

f ( x) =

c)

f ( x) = x − 25

d)

f ( x) = log

e)

f ( x) =

2

( x + 1)·( x + 2) x+3

3x − 5 x−2

3x + 1 x −1

g)

1 x x+6

7x f ( x) = log 12 x 3 k) f) f ( x) = x −5 2x + 5 Soluciones: a) (-5/3 , +∞); b) R – {3 , 4}; c) (-∞ , -5] U [5 , +∞); d) (-3 , -2) U (-1 , +∞); e) (-∞ , 5/3] U (2 , +∞); f) (-5/2 , +∞); g) [-1/3 , 1) U (1 , +∞); h) R – {0}; i) [-6 , +∞); j) (-∞ , -1) U (3 , +∞); k) (-∞ , 0) U (5 , +∞).

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