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Number of integers satisfying the inequa...

Number of integers satisfying the inequality
`(1/3)^(|x+2|/(2-|x|)) > 9` is

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To solve the inequality \((1/3)^{(|x+2|/(2-|x|))} > 9\), we can follow these steps: ### Step 1: Rewrite the Inequality We start by rewriting the inequality in terms of base 3: \[ (1/3)^{(|x+2|/(2-|x|))} > 9 \] This can be rewritten as: \[ 3^{-1 \cdot (|x+2|/(2-|x|))} > 3^2 \] Since both sides have the same base, we can drop the base and reverse the inequality: \[ -\frac{|x+2|}{2-|x|} > 2 \] ### Step 2: Multiply by -1 Multiplying both sides by -1 (which reverses the inequality): \[ \frac{|x+2|}{2-|x|} < -2 \] Since the left side is always non-negative (as it is an absolute value divided by a positive quantity), this inequality has no solutions. Thus, we need to analyze the cases for \(x\) to see if we can find any valid solutions. ### Step 3: Break into Cases We need to consider different cases based on the value of \(x\). #### Case 1: \(x < -2\) In this case: - \(|x+2| = -x - 2\) - \(|x| = -x\) Substituting these into the inequality: \[ \frac{-x - 2}{2 - (-x)} < -2 \] This simplifies to: \[ \frac{-x - 2}{2 + x} < -2 \] Cross-multiplying (noting that \(2 + x > 0\) for \(x < -2\)): \[ -x - 2 > -2(2 + x) \] This leads to: \[ -x - 2 > -4 - 2x \] Rearranging gives: \[ x < -2 \] This does not provide any new information, so we check for solutions in this range. #### Case 2: \(-2 \leq x < 0\) Here: - \(|x+2| = x + 2\) - \(|x| = -x\) Substituting gives: \[ \frac{x + 2}{2 - (-x)} < -2 \] This simplifies to: \[ \frac{x + 2}{2 + x} < -2 \] Cross-multiplying: \[ x + 2 > -2(2 + x) \] This leads to: \[ x + 2 > -4 - 2x \] Rearranging gives: \[ 3x > -6 \implies x > -2 \] So, in this case, we have \(-2 < x < 0\). #### Case 3: \(x \geq 0\) Here: - \(|x+2| = x + 2\) - \(|x| = x\) Substituting gives: \[ \frac{x + 2}{2 - x} < -2 \] Cross-multiplying: \[ x + 2 > -2(2 - x) \] This leads to: \[ x + 2 > -4 + 2x \] Rearranging gives: \[ 2 > x \] Thus, we have \(0 \leq x < 2\). ### Step 4: Combine the Cases From Case 2 and Case 3, we have: 1. From Case 2: \(-2 < x < 0\) 2. From Case 3: \(0 \leq x < 2\) Combining these gives: \[ -2 < x < 2 \] ### Step 5: Find Integer Solutions The integers satisfying \(-2 < x < 2\) are: - \( -1, 0, 1 \) ### Final Count Thus, the number of integers satisfying the inequality is: \[ \text{Number of integers} = 3 \]
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