Question 1066538
{{{A=(matrix(3,3,
1,4,-1,
2,7,-2,
-1,-5,2))}}}
.
.
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{{{A^(-1)=(matrix(3,3,
-4,3,1,
2,-1,0,
3,-1,1))}}}
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{{{x=A^(-1)*b}}}
{{{x=(matrix(3,3,
-4,3,1,
2,-1,0,
3,-1,1))*(matrix(3,1,3,5,-7))}}}
{{{x=(matrix(3,1,-4,1,-3))}}}