Factorise by grouping method:

$(2 a - b)^{2} - 10 a + 5 b$

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Solution

$(2 a - b)^{2} - 10 a + 5 b = (2 a - b)^{2} - 5 (2 a - b) = (2 a - b) (2 a - b - 5)$

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