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x2 - 4x - 21 = x2 - 7x + 3x - 21 = x(x - 7) + 3(x - 7) = (x - 7)(x + 3)

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Wiki User

15y ago
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(x + 3)(x - 7)

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Wiki User

9y ago
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Q: Factor x squared - 4x - 21?
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