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Q.If ∣x+1∣x+1>0\dfrac{|x+1|}{x+1} > 0, x∈Rx \in \mathbb{R}, then :

(a) x∈[−1,∞)x \in [-1, \infty)
(b) x∈(−1,∞)x \in (-1, \infty)
(c) x∈(−∞,−1)x \in (-\infty, -1)
(d) x∈(−∞,−1]x \in (-\infty, -1]
CBSECBSE Class XII Board 2023MCQ· 1mImportance★★★★★est
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∣x+1∣x+1>0\dfrac{|x+1|}{x+1}>0 forces x+1>0x+1>0, i.e. x∈(−1,∞)x\in(-1,\infty).

For t≠0t\neq 0: ∣t∣t=+1\dfrac{|t|}{t}=+1 if t>0t>0 and −1-1 if t<0t<0; it is undefined at t=0t=0.

  1. Let t=x+1t=x+1. The expression ∣t∣t>0\dfrac{|t|}{t}>0 holds only when t>0t>0.
  2. So x+1>0⇒x>−1x+1>0 \Rightarrow x>-1. …

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