3(a+b)²-2a-2b-8
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Step-by-step explanation:
→ 3(a+b)²-2a-2b-8
→ 3(a² + b² +2ab) - 2a-2b-8
→ 3a² + 3b² + 6ab - 2a - 2b - 8
→ 3a² - 2a + 3b² - 2a + 6ab - 8
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