Reflection across the yaxis: $y = f(x)$  Relations and Functions
Reflection across the yaxis: $y = f(x)$
Besides translations, another kind of transformation of function is called reflection. If a reflection is about the yaxis, then, the points on the right side of the yaxis gets to the right side of the yaxis, and vice versa.
Lessons

a)
Sketch the following functions:
$y = {\left( {x  4} \right)^3}$ VS. $y = {\left( {  x  4} \right)^3}$ 
b)
Compared to the graph of $y = {\left( {x  4} \right)^3}$:
• the graph of $y = {\left( {  x  4} \right)^3}$ is a reflection in the ________________________.


a)
$y = f\left( {  x} \right)$

b)
In conclusion:
• $\left( x \right) \to \left( {  x} \right)$: reflection in the _________________________ ? all $x$ coordinates _________________
