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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 6 - No. 10)

Which of these is the expanded form of (x + 2)(x + 1) ?
x^2 + 3x + 2
x^2 - 3x + 2
x^2 + x + 2
x^2 - x - 2

Объяснение

x^2 + 2x + x + 2 = x^2 + 3x + 2

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