Mathematics for IGCSE & O level - Algebraic Manipulation (Section 2 - No. 4)

Expand (x + 7)(x - 7)

x² + 49

x² - 49

x² + 14x + 49

x² - 14x + 49

Explication

(x + 7)(x - 7) = x² -7x +7x -49 = x² - 49

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