# Find the value is

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

From factor theorem

If (x + 1) and (x – 1) are factors of f (x) then f (-1) = 0 and f (1) = 0 respectively.

f (-1) = 0

(-1)4 + a (-1)3 – 3 (-1)2 + 2 (-1) + b = 0

1 – a – 3 – 2 + b = 0

b – a – 4 = 0 (i)

Similarly, f (1) = 0

(1)4 + a (1)3 – 3 (1)2 + 2 (1) + b = 0

1 + a – 3 + 2 + b = 0

a + b = 0 (ii)

Adding (i) and (ii), we get

2b – 4 = 0

2b = 4

b = 2

Putting the value of b in (i), we get

2 – a – 4 = 0

a = -2

Hence, a = -2 and b = 2.

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