Mathematics for IGCSE & O level - Algebraic Manipulation (Section 4 - No. 31)

What are the factors of x² - 1?

(x+1)(x+1)

(x-1)(x-1)

(x-1)(x+1)

(x-1)(x-2)

Vysvětlení

Using the difference of squares, x² - 1 = (x+1)(x-1)

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