Expand each of the following, using suitable identities:
$(- 2 x + 3 y + 2 z)^{2}$

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Solution

$(- 2 x + 3 y + 2 z)^{2}$
$= 4 x^{2} + 9 y^{2} + 4 z^{2} - 12 x y + 12 y z - 8 x z$

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