System of Linear Equations - Cholesky's Method

A=[683.262147.8347287.364147.8347420.7673272.9326287.364272.9326560.2966]A = \begin{bmatrix} 683.262 & -147.8347 & -287.364 \\ -147.8347 & 420.7673 & -272.9326 \\ -287.364 & -272.9326 & 560.2966 \end{bmatrix} Find the lower triangular matrix L given that L × LT = A
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[27.2085006.094715.8594010.478611.772312.6316]×Z=[89.037880.116914.7205]\begin{bmatrix} 27.2085 & 0 & 0 \\ -6.0947 & 15.8594 & 0 \\ -10.4786 & -11.7723 & 12.6316 \end{bmatrix} × Z = \begin{bmatrix} 89.0378 \\ 80.1169 \\ 14.7205 \end{bmatrix} Find the value of Z.
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