Mathematics for IGCSE & O level - Algebraic Manipulation (Section 2 - No. 22)

Expand (x - 1)(x + 1)

x² + 1

x² - 1

x² + 2x + 1

x² - 2x + 1

Paliwanag

(x-1)(x+1) = x² + x - x - 1 = x² - 1

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