Functions and function notation

What you'll learn

1. 1

   A function is like a machine that takes an input, does something to it, and gives you an output. 🏭

2. 2

   If a function machine adds 5, what comes out when you put in 3?

3. 3

   Let's try a function written as f(x) = 2x + 1. We'll find f(3).

4. 4

   Try this function machine: f(x) = 3x - 2. What is f(4)?

5. 5

   For the function f(x) = 5x, what is f(2)?

6. 6

   Match the input to the output for f(x) = x² + 1.

7. 7

   If f(x) = 10 - x, what is f(3)?