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Problem 17 - Entrance Test

Factor x² + 7x + 12.

A. (x + 3)(x + 4)B. (x + 2)(x + 6)C. (x + 1)(x + 12)D. (x + 5)(x + 2)

Correct: A

Find factors of 12 that add to 7: 3 and 4 ⇒ (x + 3)(x + 4).