Answer:
True
Step-by-step explanation:
For any function of the form
the coefficient a produces a reflection of the function whenever
.
We can verify it in the following way.
Take, for example, the function:

Now let's make 

Now let's
in the following function:

We have:

We can see then that the function was reflected in the axis -y by placing a negative coefficient a.
You can see more examples in the attached images
Therefore we can conclude that the statement is true.