If $\left| \begin{array}{ccc} x+1 & 3 & 5 \\ 2 & x+2 & 5 \\ 2 & 3 & x+4 \end{array} \right| = 0$,then $x =$

  • A
    $1, 9$
  • B
    $-1, 9$
  • C
    $-1, -9$
  • D
    $1, -9$

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The number of real values of $t$ such that the system of homogeneous equations
$\begin{aligned}
t x+(t+1) y+(t-1) z &=0 \\
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(t-1) x+(t+2) y+t z &=0
\end{aligned}$
has non-trivial solutions is

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