factorise x^3 + x^2 - 20x - 24
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x {}^{3} - {x}^{2} - 20x - 24x
3
−x
2
−20x−24
= ( {x}^{2} - 4x - 8) \times (x + 3)=(x
2
−4x−8)×(x+3)
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