Respuesta :

Answer:

answer is 27/7

Step-by-step explanation:

F(19) means u have to put the value of x as 19

so by putting 19 we get

3/19+2 -root (19-3)

so 3/21 - root 16

or 3/21 -4

or 3- 84/21

or 81/21

ans= 3x27/3x7= 27/7

thank u

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