2.1 Function idea
A function is a rule that assigns exactly one output to each input in its domain.
We write:
TEXT
y = f(x)
2.2 Evaluating a function
If f(x) = 2x - 3, then:
TEXT
f(4) = 2(4) - 3 = 5
f(0) = -3
2.3 Domain and range (starter)
- Domain: allowed inputs
- Range: produced outputs