Question

Evaluate the determinant: $\left|\begin{array}{ccc}8& 2& 7\\ 12& 3& 5\\ 16& 4& 3\end{array}\right|$

Answer 1

$\left|\begin{array}{ccc}8& 2& 7\\ 12& 3& 5\\ 16& 4& 3\end{array}\right|$

Expanding the determinant, we get

$=8(9-20)-2(36-80)+7(48-48)$

$=-88+88$

$=0$