The expansion of (a - 2b )2 is
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The expansion of (a-2b)² is
====>>>> a²+4b²-4ab
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(a − 2b)² = (a)² + (2b)² - 2 ×a× 2b [(a - b)² = a² + b² − 2ab]
= a² + 4b² - 4ab
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