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Problem: triangular [[8,-6,2],[-6,7,-4],[2,-4,3]] [ Calculator, Method and examples ]

Solution:
Your problem -> triangular [[8,-6,2],[-6,7,-4],[2,-4,3]]

A =
 8 -6 2 -6 7 -4 2 -4 3

R_2 larr R_2+3/4xx R_1

=
 8 -6 2 0 5/2 -5/2 2 -4 3

R_3 larr R_3-1/4xx R_1

=
 8 -6 2 0 5/2 -5/2 0 -5/2 5/2

R_3 larr R_3+ R_2

=
 8 -6 2 0 5/2 -5/2 0 0 0

:.U =
 8 -6 2 0 5/2 -5/2 0 0 0

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