Transforming Functions Graphs - Horizontal Stretch - Scale Factor 1/a - Examples - Detailed Lesson

In this video on transforming functions' graphs, we learn about the horizontal stretch. The horizontal stretch, written y = f(bx), is characterised by the scale factor 1/b (the reciprocal of b) by which we multiply every x-coordinate of the original curve to obtained the transformed one. With 2 examples we see how to sketch the curves of y=f(2x) as well as y = f(x/3). We also learn why the scale factor is 1/b. ******* TIME STAMPS / CHAPTERS ******* 00:00 Introduction and formula y=f(bx) scale factor 1/b 01:41 Example 1 : y=f(2x) 06:22 Example 2 : y=f(x/3) 10:40 Scale Factor : understanding why it's 1/b