find the value of a and b so that (z+1) and (z-1) are factors of z⁴+az²+2z²-3z+b
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solve this question by taking (z+1) value as z=-1 and in (z-1) value as z=1 and put it value in the equation to find the solution
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z⁴+az³+2z²-3z+b
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