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Mathematics for IGCSE & O level - Algebraic Manipulation (Section 6 - No. 43)

Expand and simplify: (x+1)(x-5)
x^2 - 4x - 5
x^2 + 4x - 5
x^2 - 6x + 5
x^2 + 6x + 5

解释

Using FOIL: x^2 -5x + x -5 = x^2 - 4x - 5

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