Xavier performs the elementary row operation represented by R1−12R2 on matrix A.
A=[ 4 3 0 ]
[-6 -3 12]
What matrix results from this transformation?
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If I've interpreted your question correctly, then , assuming that it's row1 replaced by row1 - 12*row2, we have
A → [4 - 12*(-6), 3 - 12*(-3), 0 - 12*12]
[ -6, -3, 12 ]
I'll leave you to do the number crunching!
