Question 935052
Zero of 4, multiplicity 1.
Zero of -6, multiplicity 3.


The zeros are the critical values.  Touch or cross?  Check the three intervals around the critical values.


Less than -6:
(-)(-)=(+), positive.


Between -6 and 4:
(-), and x=0 is a convenient test value.
negative.


Greater than 4:
Positive.


The graph of f(x) CROSSES the horizontal axis at the zeros of f.