Reflecting functions: examples  Transformations of functions  Algebra 2  Khan Academy  Summary and Q&A
TL;DR
The video provides practice examples on reflections of functions, discussing how to graph and find the equations of reflected functions.
Key Insights
 ✖️ Reflecting a function over the yaxis involves replacing x with x, while reflecting over the xaxis involves multiplying the entire function by 1.
 ❣️ By combining both reflections, you can mirror a function over both the xaxis and yaxis.
 📈 Understanding the concept of reflecting functions is useful when graphing or finding equations of reflected functions.
 Graphing g(x) when defined as g(x) = f(x) results in a mirror image of f(x) over the yaxis.
 ☺️ Graphing g(x) when defined as g(x) = f(x) results in a mirror image of f(x) over the xaxis.
Transcript
 [Instructor] What we're going to do in this video is do some practice examples of exercises on Khan Academy that deal with reflections of functions. So this first one says this is the graph of function f. Fair enough. Function g is defined as g of x is equal to f of negative x. Also fair enough. What is the graph of g? And on Khan Academy, it's m... Read More
Questions & Answers
Q: How can you graph the function g(x) when it is defined as g(x) = f(x)?
To graph g(x), you need to reflect the graph of f(x) over the yaxis. Each point on the graph of f(x) will have the same yvalue but with the opposite xvalue, resulting in the graph of g(x).
Q: What happens when g(x) is defined as the negative of f(x)?
If g(x) = f(x), the graph of g(x) will be a reflection of f(x) over the xaxis. Each point on the graph of f(x) will have the same xvalue but with the opposite yvalue, resulting in the graph of g(x).
Q: Can you explain how to find the equation of g(x) when it reflects both over the xaxis and yaxis?
If g(x) = f(x), you need to reflect f(x) over both the xaxis and yaxis. This means that you multiply the entire function f(x) by 1, resulting in g(x) = f(x) as the equation of the reflected function.
Q: How would you find the equation of g(x) when it reflects across the yaxis?
When g(x) reflects across the yaxis, it has the equation g(x) = f(x). You replace all instances of x in the equation of f(x) with x to obtain the equation for g(x).
Summary & Key Takeaways

The video discusses the reflection of a function f(x) in function g(x) defined as g(x) = f(x), demonstrating the process of graphing g(x) by reflecting f(x) over the yaxis.

Another example is presented where g(x) is defined as the negative of f(x), resulting in a reflection of f(x) over the xaxis.

The concept of reflecting a function over both the xaxis and yaxis is explored, where g(x) = f(x).

The last example involves finding the equation of g(x) by reflecting f(x) across the yaxis.