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Find all \(x \in \mathbb{R}\) that satisfy the following inequalities. (a) \(|x-1|>|x+1|\), (b) \(|x|+|x+1|<2\).

Short Answer

Expert verified
(a) No solution. (b) \(x < 0.5\).

Step by step solution

01

Solving for (a): \(|x-1|>|x+1|\)

We start by breaking this into two cases depending on the sign of \(x-1\) and \(x+1\). Case 1: If \(x-1 \geq 0\) and \(x+1 \geq 0\), then the inequality becomes \(x-1 > x+1\), which solves to \(x < 1\). Case 2: If \(x-1 < 0\) and \(x+1 \leq 0\), the inequality becomes \(-(x-1) > -(x+1)\), which solves to \(x > -1\). Considering both cases, it appears there are no values of \(x\) that satisfy both conditions simultaneously.
02

Solving for (b): \(|x|+|x+1|

Similar to step 1, this will be broken down based on the sign of \(x\) and \(x+1\). Case 1: If \(x \geq 0\) and \(x+1 \geq 0\), the inequality becomes \(x + x+1 < 2\), which solves to \(x < 0.5\). Case 2: For \(x \geq 0\) and \(x+1 < 0\), the inequality becomes \(x - (x+1) < 2\), which yields no solution as it implies \(x < -1\) (but we're considering \(x \geq 0\) in this case). Case 3: For \(x < 0\) and \(x+1 \geq 0\), the inequality becomes \(-(x + x+1) < 2\), which again yields no solution for similar reasons to Case 2. Case 4: For \(x < 0\) and \(x+1 < 0\), the inequality becomes \(-(x) - (x+1) < 2\), which solves to \(x > -1\). However, this condition doesn't match Case 4's assumption that \(x < 0\). Thus, the only solution here is when \(x\) satisfy Case 1, i.e. \(x < 0.5\).

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