Mathematics for IGCSE & O level - Algebraic Manipulation (Section 1 - No. 34)

What are the factors of x² - 81?

(x - 9)(x - 9)

(x + 9)(x + 9)

(x + 9)(x - 9)

(x + 27)(x - 3)

解释

Difference of squares, so it is (x+9)(x-9)

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