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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 3 - No. 40)

Which of these is a perfect square trinomial?
x² + 4x + 5
x² + 6x + 9
x² + 10x + 21
x² - 3x + 4

Penjelasan

x² + 6x + 9 = (x + 3)², making it a perfect square trinomial.

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