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( 3 1 ) − 2 = 9 , and so the expression in the exponent must be less than − 2 :
x − 2 ∣ x ∣ + 1 < − 2
Suppose that x > 2 . Then,
x + 1 3 x x < − 2 ( x − 2 ) < 3 < 1 A contradiction!
Now suppose that x < 2 . Then,
∣ x ∣ + 1 > − 2 ( x − 2 )
If x > 0 :
x + 1 3 x x > − 2 ( x − 2 ) > 3 > 1
If x < 0 :
− x + 1 x > − 2 ( x − 2 ) > 3 A contradiction!
Therefore, the interval that satisfies the inequality is: x ∈ ( 1 , 2 ) .