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(a + b + c)² = a² + b² + c² + 2ab + 2ac + 2bc
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(a + b + c)² = (3)²
a² + b² + c² + 2ab + 2ac + 2bc = 9
a² + b² + c² + 2(ab + ac + bc) = 9
a² + b² + c² + 2(3) = 9
a² + b² + c² + 6 = 9
a² + b² + c² = 3