For the linear system A=b as below 2 -1 0 -1 4 2 23. 0117 2 x₂ = diagonal, and U is a upper triangular. (c) Is A positive definite? Why? (a) Use Gaussian elimination to solve the following linear system. (b) Find the LU-factorization of A such that A = LU, where L is lower triar |-

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