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If x - 1 is a factor of the polynomial p...

If x - 1 is a factor of the polynomial `p(x)=x^(3)+ax^(2)+2b` and a + b = 4, then

A

`a=5,b=-1`

B

`a=9,b=-5`

C

`a=7,b=-3`

D

`a=3,b=1`

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