Let P(x)=x4+ax3+bx2+cx+dP(x) = x^4 + ax^3 + bx^2 + cx + dP(x)=x4+ax3+bx2+cx+d be a polynomial where the roots are 1,−1,2,−21, -1, 2, -21,−1,2,−2. Find the value of bbb.
-5
0
-3
1