Mathematics for IGCSE & O level - Algebraic Manipulation (Section 1 - No. 16)

What is (x + 3)(x - 3) expanded?

x² + 9

x² - 9

x² + 6x + 9

x² - 6x + 9

解释

(x+3)(x-3) = x² - 3x + 3x - 9 = x² - 9

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