Disclaimer: The material in the videos below comes mainly from outside City Tech. The presentation in these videos may differ from the one given in your class. Please consult with your instructor to confirm whether a particular approach is acceptable in your class.

  1. $\rhd$ Understand functions in terms of inputs and outputs (4:06)
  2. $\rhd$  Evaluating functions from equations (0:58)  Let $f(x)=49-x^2$, find the value of  $f(5)$.
  3. Practice Type of problem: For $g(r)=25-3r$, find the value of $g(4)$.