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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 2 - No. 43)

Which expression represents a perfect square trinomial?
x² + 5x + 6
x² - 2x + 1
x² - 9
2x² + 4x + 1

설명

(x - 1)² expands to x² - 2x + 1.

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