Question

write (5a+6b+7c)^2 in expanded form
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Answer 1

using formula:-

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

(5a+6b+7c)² = (5a)² + (6b)² + (7c)² + 2(5a)(6b) + 2(6b)(7c) + 2(5a)(7c)

= 25a² + 36b² + 49c² + 60ab + 84bc + 70ac

hope you like the answer.