A polynomial function
of degree
has at most
distinct real zeros and at most
turning points.
The function is
.
The degree of the function is
.
Since the degree of the function is
(
), the function
has at most
(
) distinct real zeros and at most
(
) turning points.
Find the real zeros by equating
to zero.
Solve the equation
by using factoring.

Apply zero product property.
\
Thus, the function
has two distinct real zeros at
and
.
Check :
\Graph the function
to confirm these zeros.
Graph of the function
is :

Observe the above graph :
\The function
has two distinct real zeros at
and
.
The possible turning points are
.
The number of possible real zeros are
.
Distinct real zeros are
and
.
Turning points are
.