Lesson

2.3 REAL FUNCTIONS




After completing this section, you should be able to:

  • identify relations and functions
  • handle function notations: \( y=f(x) \)
  • determine domain and range
  • combine two functions using composite functions: \( (g \circ f)(x) = g\big(f(x)\big) \)
  • draw a sign diagram
  • determine rational functions: \( y = \displaystyle \dfrac{x+2}{x-1} \)
  • determine its inverse functions: \( y = f^{-1}(x) \)