If-A-1-5-7-0-7-9-11-8-9-then-trace-of-matrix-A-is-

Question Number 81874 by zainal tanjung last updated on 16/Feb/20

$$\mathrm{If}\:{A}=\begin{bmatrix}{\:\:\mathrm{1}}&{−\mathrm{5}}&{\:\:\:\mathrm{7}}\\{\:\:\mathrm{0}}&{\:\:\:\:\mathrm{7}}&{\:\:\:\mathrm{9}}\\{\mathrm{11}}&{\:\:\:\:\mathrm{8}}&{\:\:\:\mathrm{9}}\end{bmatrix}\:\mathrm{then}\:\mathrm{trace}\:\mathrm{of}\: \\ $$$$\mathrm{matrix}\:{A}\:\mathrm{is} \\ $$

Commented by jagoll last updated on 16/Feb/20

$${trc}\:\left({A}\right)=\mathrm{17} \\ $$

Commented by mathmax by abdo last updated on 16/Feb/20

$${tr}\left({A}\right)=\Sigma{a}_{{ii}} =\mathrm{1}+\mathrm{7}+\mathrm{9}=\mathrm{17} \\ $$

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