Expand: (7 x+2 y)^2 - Vidyadip

Question

Expand:
$ (7 x+2 y)^2 $

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Answer

$ (7 x+2 y)^2 $
$ =(7 x)^2+2 \times 7 x \times 2 y+(2 y)^2 $
$ =49 x^2+28 x y+4 y^2 $

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