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

Giải thích

(x - 1)² expands to x² - 2x + 1.

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