Effects of changing b on a graph of f(x)=ax^2+bx+c what would happen if we changed b to a negative b?How would I present this to an audience?

The effect of reversing the sign of b on the graph of f(x)
= ax^2 + bx + c is that the graph is reflected about the
y-axis.

Or the value for f(x) is equal to the value
obtained if -x was used instead of +x.

This is evident from
the fact that :

a(-x)^2 - b(-x) + c = ax^2 + bx +
c

You can present this to an audience by using the help of
an online graphing tool. Take the graphs of ax^2 - bx + c and f(x) = ax^2 - bx + c on
the same figure and use it in your presentation to show accurately that the points x
which earlier gave the value for f(x) are now replaced by
-x.

Changing the sign of b in the function
f(x) = ax^2 + bx + c reflects the graph about the
y-axis.