Write (3a+4b+5c)² in expanded from
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Answer:
(3a + 4b + 5c)2
= (9a2 + 16b2 + 25c2 + 2(12ab +20bc + 15ca)
As (a+b+c)2 = a2 + b2 + c2 + 2(ab + bc+ ca)
= 9a2 + 16b2 + 25c2 + 24ab + 40bc + 30ca
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