Mathematics for IGCSE & O level - Algebraic Manipulation (Section 1 - No. 48)

What is the result of expanding (x - 7)(2x + 1)?

2x² - 13x - 7

2x² + 13x - 7

2x² - 15x - 7

2x² + 15x - 7

解释

(x-7)(2x+1)= 2x²+x-14x-7 = 2x²-13x-7

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