Question Number 81874 by zainal tanjung last updated on 16/Feb/20
![If A= [(( 1),(−5),( 7)),(( 0),( 7),( 9)),((11),( 8),( 9)) ] then trace of matrix A is](Q81874.png)
$$\mathrm{If}\:{A}=\begin{bmatrix}{\:\:\mathrm{1}}&{−\mathrm{5}}&{\:\:\:\mathrm{7}}\\{\:\:\mathrm{0}}&{\:\:\:\:\mathrm{7}}&{\:\:\:\mathrm{9}}\\{\mathrm{11}}&{\:\:\:\:\mathrm{8}}&{\:\:\:\mathrm{9}}\end{bmatrix}\:\mathrm{then}\:\mathrm{trace}\:\mathrm{of}\: \\ $$$$\mathrm{matrix}\:{A}\:\mathrm{is} \\ $$
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
$${tr}\left({A}\right)=\Sigma{a}_{{ii}} =\mathrm{1}+\mathrm{7}+\mathrm{9}=\mathrm{17} \\ $$