Factorise :
a2 - 23a - 108
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= a2 - 23a - 108
= a2 - (27 - 4)a - 108
= a2 - 27a + 4a - 108
= (a2 - 27a) + (4a - 108)
= a(a - 27) + 4(a - 27)
= (a - 27)(a + 4)
Hence,a2 - 23a - 108 = (a - 27)(a + 4)
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