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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 2 - No. 3)

Which expression is a perfect square trinomial?
x² + 4x + 4
x² - 4
x² + 5x + 6
x² - 6x - 9

Explanation

x² + 4x + 4 can be factored to (x + 2)²

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