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![4 [(a-1)^2 - b(a - 1 + \frac{b}{4})]](/tpl/images/1326/1089/34d9b.png)
![4(a- 1)^2 - 4b(a - 1 + \frac{b}{4} )\\\\4 [(a-1)^2 - b(a - 1 + \frac{b}{4})]](/tpl/images/1326/1089/de408.png)
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Factorise 4a^2+b^2-4ab-8a+4b+4...
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