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Mathematics for IGCSE & O level - Equations (Section 7 - No. 9)

The expression x² + 10x + 25 can be written as:
(x + 5)²
(x - 5)²
(x + 10)(x + 15)
(x + 5)(x - 5)

解释

This is a perfect square trinomial: (x+5)² = x² + 10x + 25

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