Question

A=$\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]$

Answer 1

Answer::

(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)(⌒o⌒)

$\underline{\underline{{\purple{\sf Given}}}}$

A=$\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]$

$\longrightarrow\small\boxed{\tt\red \:By\:determinant \: form}$

$\longrightarrow\small\boxed{\sf\pink{1(5\times9-6\times8)-2(4\times9-6\times7)+3(4\times8-5\times7}}$

$\implies\sf\pink{1(45-48)-2(36-42)+3(32-35)}$

$\implies\sf\pink{1(-3)-2(-6)+3(-3)}$

$\implies\sf\pink{-3+12-9}$

$\implies\sf\pink{-12+12}{\red=0}$

$\bigstar\small\boxed{\tt\blue{A=0}}$