Using the standard formulae, expand: (2 x-3 y+7 z)^2 - Vidyadip

Question

Using the standard formulae, expand:
$(2 x-3 y+7 z)^2$

✓

Answer

$4 x^2+9 y^2+49 z^2-12 x y-42 y z+28 x z$

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