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Mathematics for IGCSE & O level - Equations (Section 5 - No. 45)

Which equation represents a perfect square trinomial?
x² + 4x + 4 = 0
x² + 4x + 3 = 0
x² - 4x - 4 = 0
x² - 3x + 2 = 0

Selitys

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

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