Answer:
(a) 3
Step-by-step explanation:
The fundamental theorem of algebra tells you a polynomial has a number of roots equal to its degree.
Roots
The degree of a polynomial is the largest exponent of the variable. Here, the degree is 3. That means there are three roots.
In general, the roots of a polynomial with real coefficients will be real or pairs of complex roots. The attached graph shows the roots of this cubic function are all real (and irrational).
