Math, asked by ptiyanshi, 1 month ago

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(i) (2a - 5b - 7c)

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Answered by shrigrdpublic

2

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

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

= 4a2 + 25b2 + 49c2 - 20ab + 70bc - 28ac

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