Factorise :
m - 1 - (m - 1)2 + am - a
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= (m - 1) - (m - 1)2 + (am - a)
= 1(m - 1) - (m - 1)2 + a(m - 1)
= (m - 1)(1 - (m - 1) + a)
= (m - 1)(1 - m + 1 + a)
= (m - 1)(2 - m + a)
Hence,m - 1 - (m - 1)2 + am - a = (m - 1)(2 - m + a)
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