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Which statement about the expression is correct?

Competition practiceAlgebra
  • AIt is positive for every real value of
  • BIt is negative for every real value of
  • CIt is positive only when
  • DIt is zero for exactly one real value of

Step-by-Step Solution

, which is at least 3 for every real . Its discriminant 16 − 28 = −12 is negative, so it never reaches zero and stays positive throughout.
Answer: A) It is positive for every real value of

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