Question

find the value of a and b so that (x+1) and (x-1) are factors of
${x}^{4} + a {x}^{3} - 3 {x}^{2} + 2x + b$
plll solve this

Answer 1

put x=1
1+a-3+2+b=0
a+b=0
b=-a

put x=-1
1-a-3-2+b=0
-a+b=4
b+b=4
b=2
a=-2

hope this helps you