Question

1.O determinante da matriz A = ( 2 5 7 8 ) é a)-17 b)-18 c)-19 d)-21 e)-23

Answer 1

$A=\begin{bmatrix}2&5\\7&8\end{bmatrix}$

$\mathsf{det~A=2.8-5.7=16-35}\\\huge\boxed{\boxed{\boxed{\boxed{\mathsf{det~A=-19}}}}}$