Question

x+1/x=-1 then x^3+1=?​

Answer 1

Answer:

x+1/x = -1

x+1 = x×-1

x+1 = -x

x+x = -1

2x = -1

x= -1/2

then, x^3+1 = (-1/2)^3 + 1

1/8 +1 = 9/8