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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 8 - No. 10)

Which of the following is the expansion of (3x+1)^2?
9x^2 + 1
9x^2 + 6x + 1
9x^2 - 6x + 1
6x^2 + 6x + 1

説明

(3x+1)^2 = (3x+1)(3x+1) = 9x^2 + 6x + 1

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