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Det m e R stiind ca P(m,1) e Gf Fx= -x-1

Răspuns :

daca P(m,1)€ Gf => f(m)=1
-m-1=1
-m=2/×(-1)
m= -2 €R
deci P(-2,1)
f(m)=1
-m-1=1
-m=2
m=-2


Verificare
f(-2) =-(-2)-1=2-1=1, adevarat, bine rezolvat