Question

Q.11 Expand the following by using identity :
$(3a - 5b - 7c) {}^{2}$
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Answer 1

Answer:

(a+b+C) ^2 = a^2 + b^2 + c^2 + 2ab + 2bc + 2ac

(3a - 5b - 7c ) = 9a^2 + 25b^2 + 49c^2 - 30ab + 70bc - 28ac i hope it's help u

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