0 votes 0 votes closed as a duplicate of: Linear algebra 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 $A.$ Linear Algebra engineering-mathematics linear-algebra eigen-value + – amit166 asked Nov 15, 2018 • closed Nov 25, 2018 by Lakshman Bhaiya amit166 395 views comment Share Follow See all 2 Comments See all 2 2 Comments reply aditi19 commented Nov 24, 2018 reply Follow Share -12/17? 0 votes 0 votes Lakshman Bhaiya commented Nov 25, 2018 reply Follow Share answer is $\frac{4}{17}$ 0 votes 0 votes Please log in or register to add a comment.