Answer:

Step-by-step explanation:
The zeros of a function are all the values of x for which f (x) = 0.
Therefore to find the zeros of the function I must equal f(x) to zero and solve for x.


We have the multiplication of 3 factors x, (x-4) and (x + 2)
Then the function will be equal to zero when one of the factors is equal to zero, that is:

Note that
is a cubic function of positive principal coefficient, the graph starts from
and cuts to the x-axis at
, then decreases and cuts by second once to the x-axis at
, it finally cuts the x-axis for the third time at
and then tends to
