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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 7 - No. 32)

Which of the following is the expansion of (2x - 1)(x + 4)?
2x^2 + 7x - 4
2x^2 + 8x - 4
2x^2 - 7x - 4
2x^2 - 9x - 4

解释

2x^2 +8x - x - 4 = 2x^2 + 7x - 4

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