Expand(i) (2a - 5b - 7c) – InterviewSolution

1.

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

Answer»

(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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