Factorise 1. 1-2a-2b-3(a+b)2
2. 3a2-1-2a
3. 5-(3a2-2a)(6-3a2+2a)
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1. (a+b) (1-2-6) = (a+b) (-7)
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1. (a + b) (1-2-6) = (a + b) (-7).
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