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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 3 - No. 50)

Which expression is correct when expanding (2x - 1)(x + 4)?
2x² + 7x - 4
2x² - 7x - 4
2x² - 8x - 4
2x² + 8x - 4

Объяснение

(2x-1)(x+4) = 2x²+8x-x-4=2x²+7x-4

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