Question

How many and of which kind of roots does the equation f(x) = x³ + 2x² + 4x + 8 have?A. 3 realOB. 2 real; 1 complexOC. 2 real; 2 complexOD. 1 real; 2 complexReset Selection

Answer 1

Given the cubic equation;

`f(x)=x^3+2x^2+4x+8`

The roots of the equation are;

`x=-2,x=-2i,x=2i`

CORRECT OPTION: (D) 1 real; 2 complex