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Fie f:R-R_f (x)=-7x+13 rezolvati inecuatia f(x)≤f(2)

Răspuns :

f(2)= -7*2+13=-14+13=-1

f(2)=-1

f(x)=-7x+13

f(x)< sau egal f(2)

-7x+13< sau egal -1=>-7x=-1-13=>-7x=-14=>x=2