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Find the values of a and b so that (x + 1) and (x – 1) are factors of x4 +ax3 -3x2 +2x + b.

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Let f(x) = x4 +ax3 -3x2 +2x + b be the given polynomial.

From factor theorem; if (x+1) and (x-1) are factor of f(x) then f(-1) = 0 and f(1) = 0 respectively.

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