hard · Gre Quant

A real number x satisfies |2x - 7| < 5. Which of the following expressions must be positive for EVERY x in this range? Indicate ALL such expressions.

  1. X - 1
  2. 6 - x
  3. X^2 - 7x + 6
  4. X^2 - 5x + 6
  5. 2x - 1
  6. X^2 + 1
  7. 10 - x^2

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