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Se considera f : R --> Rr , (f)x = 2x-4 .
a ) Aratati ca f(-2) +f(2) = -8 .


Răspuns :

Avem f(x)=2x-4
         ------------

a) f(-2)=2*(-2)-4 = -4-4 = -8 
    f(2)=2*2-4=4-4= 0

f(-2)+f(2)=-8+0=-8 (Adevarat)