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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 2 - No. 18)

Which factors create the expression x² + 12x + 36 when multiplied together?
(x+6)
(x-6)
(x+6) and (x-6)
(x+6) and (x+6)

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(x+6) = x²+12x+36

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