Resposta:
[tex]\textsf{Leia abaixo}[/tex]
Explicação passo a passo:
[tex]\begin{bmatrix}\cancel-2&\cancel1&\cancel1\\\cancel2&\cancel4&\cancel1\\\cancel4&\cancel0&\cancel1\end{bmatrix}[/tex]
[tex]\mathsf{D = (-8 + 4 + 0) - (16 + 0 +2)}[/tex]
[tex]\mathsf{D = -4 - 18}[/tex]
[tex]\mathsf{D = -22}[/tex]
[tex]\mathsf{A = \dfrac{1}{2}\:.\:|\:D\:|}[/tex]
[tex]\mathsf{A = \dfrac{22}{2}}[/tex]
[tex]\boxed{\boxed{\mathsf{A = 11\:u.a^2}}}[/tex]
