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#math combat [closed]

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If $A$  is $2\times 2$ matrix ,eigen  value is $1,-2$ and corresponding eigen vector $[1,2]^{T}$ and $[9,1]^{T}$.find sum of  element of the matrix $A.$
closed as a duplicate of: Linear algebra
asked in Linear Algebra by Junior (761 points)
closed by | 68 views
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-12/17?
commented by Active (3.5k points)
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answer is $\frac{4}{17}$
commented by Boss (36.3k points)
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