2010008710

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2010008710
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Reflect the point \(R=[1; 10; -8]\) across the plane \(\omega \colon 2x-y-3z+12=0\). Hint: The line \(RR'\) is perpendicular to the plane \(\omega\) (see the picture).
\(R'=[-7;14;4]\)
\(R'=[-3;12;-2]\)
\(R'=[-1;-10;8]\)
\(R'=[-5;34;-14]\)