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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 3 - No. 43)

Which of these expressions is a difference of squares?
x² + 10x + 25
4x² - 9
x² + 4
x² + 6x - 9

Explication

4x² - 9 can be written as (2x)² - 3², fitting the form a² - b².

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