Find the square of 2a-b-3c??
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(2a - b - 3c)²
= (2a)² + (-b)² + (-3c)² + 2(2a)(-b) + 2(-b)(-3c) + 2(2a)(-3c)
= 4a² + b² + 9c² - 4ab + 6bc - 12ac
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