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Q.Solve for xx : x+3x−2≤2\dfrac{x+3}{x-2} \leq 2.

CBSECBSE Class XII Board 2023Subjective· 2mImportance★★★★★est
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x+3x−2≤2\dfrac{x+3}{x-2}\le 2 holds for x<2x<2 or x≥7x\ge 7.

Rearrange to x+3x−2−2≤0\dfrac{x+3}{x-2}-2\le 0 and combine into a single fraction, then use a sign chart. Never multiply across by x−2x-2 while its sign is unknown.

  1. Combine: x+3x−2−2=(x+3)−2(x−2)x−2=−x+7x−2=7−xx−2.\dfrac{x+3}{x-2}-2=\dfrac{(x+3)-2(x-2)}{x-2}=\dfrac{-x+7}{x-2}=\dfrac{7-x}{x-2}.
  2. The inequality becomes 7−xx−2≤0\dfrac{7-x}{x-2}\le 0, i.e. (multiplying numerator and denominator by −1-1) x−7x−2≥0.\dfrac{x-7}{x-2}\ge 0.
  3. Critical points: x=7x=7 (numerator 00) and x=2x=2 (denominator 00, so x=2x=2 is excluded). …

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