Rotate the given triangle 180° counter-clockwise about the origin. [ 0 -3 5 ] [0 1 2]

Answer:
[tex]\left[\begin{array}{ccc}0&3&-5\\0&-1&-2\end{array}\right][/tex]
Step-by-step explanation:
Rotation 180° (in either direction) about the origin causes each coordinate to have its sign changed. Effectively, the coordinate matrix is multiplied by -1.
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Additional comment
This is equivalent to reflection across the origin.