if f(x)=x^4+x^3-2x^2-8x then which of the following are true?(a)f(x)=0 has 2 real roots . (b)f(x)=0 has real roots in (-1,2)

1. sum of real roots of f(x)=0 is 2 (d) product of real roots isof f(x)=0 is 2. mutiple correct type

Hello student,
Please find the answer to your question below
Iam unable to interpret your query.i think some part of the question is missing here because check whether constant term is present or not.
If there is no constant, then one of the roots will be ‘0’ and the other root is ‘2’. Other roots are complex.