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Use Matrices to Solve

Question 69

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Use matrices to solve {12x22y2+8z2=34x2+7y2+2z2=1722x2+7y24z2=132\left\{ \begin{array} { l } 12 x ^ { 2 } - 2 y ^ { 2 } + 8 z ^ { 2 } = 3 \\4 x ^ { 2 } + 7 y ^ { 2 } + 2 z ^ { 2 } = \frac { 17 } { 2 } \\2 x ^ { 2 } + 7 y ^ { 2 } - 4 z ^ { 2 } = \frac { 13 } { 2 }\end{array} \right.

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