(5, -12); m
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Let's use Gaussian elimination. Consider the augmented matrix,
• Add row 1 to row 2, and add -1 (row 1) to row 3:
• Add -2 (row 2) to row 3:
• Add -2 (row 3) to row 2:
• Add row 2 and row 3 to row 1:
So the inverse is