Mathematics for IGCSE & O level - Algebraic Manipulation (Section 3 - No. 14)

What are the factors of x² - 25?

(x - 5)(x - 5)

(x + 5)(x + 5)

(x + 5)(x - 5)

(x + 10)(x - 5)

解释

x² - 25 is of the form a²-b², therefore (x+5)(x-5)

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