સમીકરણ left| {,begin{array}{*{20}{c}}{3 - x}& | vedclass

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Question

(c) Applying ${C_1} 	o {C_1} + {C_2} + {C_3}$, we obtain

$ - x\,\left| {\,\begin{array}{*{20}{c}}1&{ - 6}&3\1&{3 - x}&3\1&3&

Vedclass · Accepted Answer

$0$

Vedclass · Answer

(c) Applying ${C_1} 	o {C_1} + {C_2} + {C_3}$, we obtain

$ - x\,\left| {\,\begin{array}{*{20}{c}}1&{ - 6}&3\1&{3 - x}&3\1&3&{ - 6 - x}\end{array}\,} ight|$ = 0

$ \Rightarrow $ $ - x\,\left| {\,\begin{array}{*{20}{c}}1&{ - 6}&3\0&{9 - x}&0\0&9&{ - 9 - x}\end{array}\,} ight| = 0$

$ \Rightarrow $ $ - x(9 - x)\,( - 9 - x) = 0 \Rightarrow x = 0,\,9,\, - 9$.

Trick : Check by assuming the values of  $x$  from the given options.

સમીકરણ $\left| {\,\begin{array}{*{20}{c}}{3 - x}&{ - 6}&3\\{ - 6}&{3 - x}&3\\3&3&{ - 6 - x}\end{array}\,} \right| = 0$ ના બીજ મેળવો.

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