HEYY FRIENDS PLEASE SOLVE THIS
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Step-by-step explanation:
(a+b+c)² = a² + b² + c² +2(ab+bc+ca)
7² = a² + b² + c² + 2*20
49 = a² + b² + c² + 40
a² + b² + c² = 9
Answered by
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Answer:
(a+b+c)²= a²+b²+c²+2ab+2bc+2ac
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