Answer:
Real root is x = 1.
Complex roots are x = ±√7 i
Step-by-step explanation:
If x = 1 , P(x) = 0 so that is one zero of the function.
Dividing by x - 1 gives the quotient x^2 + 7.
x^2 + 7 = 0
x^2 = -7
x = ±√7 i
