Nilai lim_(x→2)⁡ (√(3x-2)-2)/(2x-4)=⋯

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Bahas Soal Matematika   »   Limit   ›  

Nilai \( \displaystyle \lim_{x \to 2} \ \frac{\sqrt{3x-2}-2}{2x-4} = \cdots \)

  1. 0
  2. 3/8
  3. 3/4
  4. 1
  5. \( 1 \frac{1}{2} \)

(SNMPTN 2008)

Pembahasan:

\begin{aligned} \lim_{x \to 2} \ \frac{\sqrt{3x-2}-2}{2x-4} &= \lim_{x \to 2} \ \frac{\sqrt{3x-2}-2}{2x-4} \times \frac{\sqrt{3x-2}+2}{\sqrt{3x-2}+2} \\[8pt] &= \lim_{x \to 2} \ \frac{(3x-2)-4}{(2x-4)(\sqrt{3x-2}+2)} \\[8pt] &= \lim_{x \to 2} \ \frac{3(x-2)}{2(x-2)(\sqrt{3x-2}+2)} \\[8pt] &= \lim_{x \to 2} \ \frac{3}{2(\sqrt{3x-2}+2)} \\[8pt] &= \frac{3}{2(\sqrt{3(2)-2}+2)} \\[8pt] &= \frac{3}{8} \end{aligned}

Jawaban B.