Factorise :
x2 - x - 72
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= x2 + (- 9 + 8)x - 72
= x2 - 9x + 8x - 72
= x(x - 9) + 8(x - 9)
= (x - 9)(x + 8)
Hence,x2 - x - 72 = (x - 9)(x + 8)
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