Answer and explanation

Correct answer: A.

  1. Step 1: Expand the left-hand side first: . Subtract 14 from both sides to form a standard quadratic: .
  2. Step 2: Factorize : . Setting each factor to zero gives or .
Answer
.
Why not the others: '' assumes the right-hand side is zero rather than 14; '' reverses the signs of the factors; '' does not satisfy the expanded quadratic equation.

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