Zbiorem wartości funkcji opisanej wzorem jest ZW = { -1, -3, 0, 4}. Wyznacz dziedzinę tej funkcji.
f(x) = - 1
czyli
( x -2)/ (2x + 4) = -1
x -2 = - 2x - 4
3 x = -2
x = -2/3
-------------
f(x) = -3
( x -2) / (2x + 4) = - 3
x - 2 = - 6x - 12
7x = - 10
x = - 10/7
-----------------
f(x) = 0
(x -2) / ( 2x + 4) = 0
x -2 = 0
x = 2
-----------
f(x) = 4
(x -2) / ( 2x + 4) = 4
x - 2 = 8x + 16
7 x = - 18
x =- 18/ 7
---------------
Odp. Df = { - 18/7 , - 10/7, -2/3 , 2 }
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f(x) = - 1
czyli
( x -2)/ (2x + 4) = -1
x -2 = - 2x - 4
3 x = -2
x = -2/3
-------------
f(x) = -3
czyli
( x -2) / (2x + 4) = - 3
x - 2 = - 6x - 12
7x = - 10
x = - 10/7
-----------------
f(x) = 0
czyli
(x -2) / ( 2x + 4) = 0
x -2 = 0
x = 2
-----------
f(x) = 4
czyli
(x -2) / ( 2x + 4) = 4
x - 2 = 8x + 16
7 x = - 18
x =- 18/ 7
---------------
Odp. Df = { - 18/7 , - 10/7, -2/3 , 2 }
=======================================