vcaa 2007 Exam 2 MC Qn6

[ggxoxo]

Can someone please help me with the question stated in the title??? Why is the answer B and not C???

Thanks!

[studynotes]

as the function has 5 roots, because of the conjugate root theorem if all coefficients are then the imaginary roots must be the conjugate of each other..and therefore the imaginary roots must come in like pairs..

so answer B is correct since it has 4 imaginary roots and roots are in conjugate pairs..while in C it is not...

hope this helps