Which equation results from taking the square root of both sides of (x + 9)2 = 25?

Taking the square root of both sides of (x + 9)² = 25 gives √((x + 9)²) = ±√25. Thus x + 9 = ±5, so choice C is correct. The ± is needed because both 5² and (−5)² equal 25.

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