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Question: One root of the equation \(\left| \begin{matrix} 3x–8 & 3 & 3 \\ 3 & 3x–8 & 3 \\ 3 & 3 & 3x–8 \end{m...

One root of the equation 3x83333x83333x8\left| \begin{matrix} 3x–8 & 3 & 3 \\ 3 & 3x–8 & 3 \\ 3 & 3 & 3x–8 \end{matrix} \right| = 0 is –

A

8/3

B

2/3

C

1/3

D

16/3

Answer

2/3

Explanation

Solution

Let C1 → C1 + C2 + C3; C2 → C2 – C3

3x2033x23x1133x2113x3x8\left| \begin{matrix} 3x–2 & 0 & 3 \\ 3x–2 & 3x–11 & 3 \\ 3x–2 & 11–3x & 3x–8 \end{matrix} \right| = 0

∴ X = 2/3 is one root.