Factorise: x² + 20x + 100

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• A (x+10)(x+10)
• B (x+5)(x+10)
• C (x+10)(x+3)
• D (x+2)(x+10)

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Answer: A. (x+10)(x+10)

Split the middle term: x² + 10x + 10x + 100 = x(x + 10) + 10(x + 10) = (x + 10)(x + 10).

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