Machine-translated by Google. Questions are authored in English.
Top

Discussion

If \(\begin{vmatrix} 1 & 0 & 0 \\ x & x+2 & 0 \\ x^{2} & x & x+3 \end{vmatrix} = 0\), then value of x are

  • A.2,3
  • B.-2,3
  • C.-2,-3
  • D.1,2,3
  • E.-1,2,-3

Answer: C

The values are −2, −3.

The determinant is lower triangular (all entries above the diagonal are zero), so it equals the product of the diagonal entries:

\[ \begin{aligned} 1 \cdot (x + 2)(x + 3) &= 0 \\ &\Rightarrow x \\ &= -2 \text{ or } x \\ &= -3 \end{aligned} \]

The options 2, 3 and −2, 3 have the wrong signs, and no factor gives 1 or −1.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.