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Câu 5:

Cho f( x ) = a² + bx + c ,(a # 0 ). Điều kiện để $f (x)\le 0 , \forall x \in R$

Câu 5: Cho f( x ) = a2 + bx + c ,(a # 0 ). Điều kiện để f(x)≤0,∀x∈Rf (x)\le 0 , \forall x \in Rf(x)≤0,∀x∈R là

Thông tin câu hỏi

Câu 5:

Cho f( x ) = a² + bx + c ,(a # 0 ). Điều kiện để $f (x)\le 0 , \forall x \in R$ là