for which value of x is this matrix invertible:
1 0 2
2 x 2
2 1 (x+1)
Determinant of this matrix = 0
I've worked out that x must be +1 or +2 but I'm stuck on where to go from there
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You're doing OK. In order to be invertible, the determinant can't be 0.
It is 0 at x=1 and x=2. Therefore, all other values must be in the domain of invertibility.
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