find the values of a and b so that (x+1) and x-1 are factor of x^4+ax^3-3x^2+2x+b
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by taking x=-1 weget 1-a-3-2+b=0=> -a+b=4------(1)
by takingx=1 weget 1+a-3+2+b=0 =>a+b=0----(2)
by solving eq(1)&(2) weget a=-2 &b=2
by takingx=1 weget 1+a-3+2+b=0 =>a+b=0----(2)
by solving eq(1)&(2) weget a=-2 &b=2
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