Cho lim f( x) = - 2. Tính Lim f(x) - 4x+1

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Cho \(\mathop {\lim }\limits_{x \to 3} {\mkern 1mu} f\left( x \right) = - 2\). Tính \(\mathop {\lim }\limits_{x \to 3} {\mkern 1mu} \left[ {f\left( x \right) + 4x - 1} \right]\).

\(5\).

\(6\).

\(11\).

\(9\).

Giải thích

Chọn D

Ta có\(\mathop {\lim }\limits_{x \to 3} {\mkern 1mu} \left[ {f\left( x \right) + 4x - 1} \right] = \mathop {\lim }\limits_{x \to 3} f\left( x \right) + \mathop {\lim }\limits_{x \to 3} {\mkern 1mu} \left( {4x - 1} \right) = - 2 + 4.3 - 1 = 9\).