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If $A = [\begin{array}{lll} 1 0 2 \\ 5 1 x \\ 1 1 1 \end{array}]$ is a singular matrix, then x is equal to

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Correct option is C

As A is a singular matrix,|A|=0⇒10051x−1011−1=0 [using C3→C3−2C1]⇒ 1x−101−1=0 ⇒ −1∣−x+10=0⇒ x=9

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If A=1 0 25 1 x1 1 1 is a singular matrix, then x is equal to

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If $A = [\begin{array}{lll} 1 0 2 \\ 5 1 x \\ 1 1 1 \end{array}]$ is a singular matrix, then x is equal to