factorise - 25a^2 - b^2 - 2ab
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Step-by-step explanation:
25a² - b² - 2ab
= (5a) ² - 2ab - b²
=> (5a) ² - 2ab + b² - 2b²
=> (5a-b) ² -8ab - 2b²
=> (5a-b) ² -2b(4a+b)
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