Factorise :
a2 + 5a - 6
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= a2 + (6 - 1)a - 6
= a2 + 6a - 1a - 6
= (a2 + 6a) - (1a + 6)
= a(a + 6) - 1(a + 6)
= (a + 6)(a - 1)
Hence, a2 + 5a - 6 = (a + 6)(a - 1)
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