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For what value of x , the matrix [5-xx+1...

For what value of `x ,` the matrix `[5-xx+1 2 4]` is singular?

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For matrix`[ [5−x,x+1],[2,4​]]`
being singular
`abs( [5−x,x+1],[2,4​])`
`20−4x−2x−2=0`
`18−6x=0`
`6x=18`
...
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