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Find the value of a and b if (x-1) and (...

Find the value of a and b if (x-1) and (x+1) are factors of
`x^4 + ax^3 - 3x^2 + 2x + b`

A

`2, -1`

B

`-2, 1`

C

`-2,2`

D

`1, -1`

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