Mathematics for IGCSE & O level - Algebraic Manipulation (Section 1 - No. 15)

Expand (x + 5)(x - 5)

x² + 25

x² - 25

x² + 10x + 25

x² - 10x + 25

解释

(x+5)(x-5) = x² -5x +5x -25 = x²-25

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