Mathematics for IGCSE & O level - Algebraic Manipulation (Section 4 - No. 17)

Which expression is an example of the difference of two squares?

x² + 4

x² - 9

x² + 6x + 9

(x + 2)²

הֶסבֵּר

x² - 9 can be written as (x+3)(x-3)

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