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19. Find the value of \( x \) such that \[ \left[\begin{array}{lll} 1 & x & 1 \end{array}\right]\left[\begin{array}{rrr} 1 & 3 & 2 \\ 2 & 5 & 1 \\ 15 & 3 & 2 \end{array}\right]\left[\begin{array}{l} 1 \\ 2 \\ x \end{array}\right]=0 \]

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19. Find the value of \( x \) such that \[ \left[\begin{array}{lll} 1 & x & 1 \end{array}\right]\left[\begin{array}{rrr} 1 & 3 & 2 \\ 2 & 5 & 1 \\ 15 & 3 & 2 \end{array}\right]\left[\begin{array}{l} 1 \\ 2 \\ x \end{array}\right]=0 \]
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https://www.sarthaks.com/?qa=blob&qa_blobid=15901135108322002303

Find the value of x such that

Multiplying first and second Matrices

2x + 16 +12 +10x + 4x +x2 = 0 

x2 + 16x + 28 = 0 

( x +14 )(x+2 ) = 0 

x = -14 or -2

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