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Question
Evaluate the determinant.
`|(x^2-x+1, x -1),(x+1, x+1)|`
Solution
`abs ((x^2 - x + 1, x - 1),(x + 1, x + 1))`
`= (x^2 - x + 1) xx (x + 1) - (x + 1) xx (x - 1)`
`= x^3 + x^2 - x^2 - x + x + 1 - (x^2 + x - x - 1)`
`= x^3 - x^2 + 2`
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