Question

answer it fast
it's urgent​

Answer 1

$\begin{vmatrix} x & - 1 & 2 \\ 2x & 1 & - 3 \\ 3 &- 4 & 5 \end{vmatrix} =29$

$\sf \: x(1 \times 5 - 4 \times 3) - ( - 1)(10x + 9) + 2( - 8x - 3) = 29$

$\sf \: x( 5 - 12) + (10x + 9) + 2( - 8x - 3) = 29$

$\sf \: - 7x + 10x + 9 - 13x - 6= 29$

$\sf \: - 10x + 3= 29$

$\sf \: - 10x = 29 - 3$

$\sf \: - 10x = 26$

$\sf \: x = - 2.6$