find the no. of least imaginary roots of the eq. x9 + 5x8 - x3 + 7x + 2 = 0

 

a. 2           b. 4             c. 6             d. 8

 

the hint was given as ----

total no. of roots - no. of real roots

 

here the total no. of roots is 9

 

how do we find the no. of real roots?

plz. help