(_____a+______b)²=4a²+_____+9b²
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(_____a+______b)²=4a²+_____+9b²
(_____a+______b)²=4a²+_____+9b²
(_____a+______b)²=4a²+_____+9b²
(2a+3b)²=4a²+12ab+9b²
(__2___a+___3___b)²=4a²+__12ab___+9b²