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Find the non-zero positive value of x which satisfies the equation  \(\begin{bmatrix} x & 1...

Mathematics
JAMB 2020

Find the non-zero positive value of x which satisfies the equation 

\(\begin{bmatrix} x & 1 & 0 \\ 1 & x & 1 \\ 0 & 1 & x \end{bmatrix}\) = 0

  • A. 2
  • B. \(\sqrt{3}\)
  • C. \(\sqrt{2}\)
  • D. 1
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Correct Answer: Option C
Explanation

\(\begin{bmatrix} x & 1 & 0 \\ 1 & x & 1 \\ 0 & 1 & x \end{bmatrix}\) = 0

To find the value of x, we will have to calculate for the determined of the given matrix and equate it to 0

x[x\(^2\) - 1] - 1[x - 0] + 0[0 - 1] = 0

x\(^3\) - x] - x + 0 = 0

x\(^3\) - x - x = 0

x\(^3\) - 2x = 0

x\(^3\) = 2x 

x\(^2\) = 2 

take the square root of both sides

x = \(\sqrt{2}\)

There is an explanation video available below.


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Explanation Video

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