Questão 29 (ITA-06) Se \left|\begin{array}{lll}a & b & c \\\ p & q & r \\\ x & y & z\end{array}\right|=1, calcule \left|\begin{array}{ccc}-2 a & -2 b & -2 c \\\\ 2 p+x & 2 q+y & 2 r+z \\\\ 3 x & 3 y & 3 z\end{array}\right|.
Passo 1
O enunciado dá o valor do determinante
\begin{vmatrix} a & b & c \\\ p & q & r \\\ x & y & z \end{vmatrix} = 1