Question

calcule o determinante da matriz

Answer 1

66)
a)
$\displaystyle \det \left|\begin{array}{ccc}x&x+1\\8&3\end{array}\right|=3x-8x-8=\boxed{-5x-8}$

b)
$\displaystyle \det \left|\begin{array}{ccc}x&2\\x+2&3x+1\end{array}\right|=3x^2+x-2x-4=\boxed{3x^2-x-4}$