factorise:(a-b)²+4ab
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( a - b )² + 4ab
( a - b )² + 4ab= a² + b² - 2ab + 4ab
( a - b )² + 4ab= a² + b² - 2ab + 4ab= a² + b² + 2ab
( a - b )² + 4ab= a² + b² - 2ab + 4ab= a² + b² + 2ab= ( a + b )²
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