Description

8 steps: (1) f(x) is read 'f of x'. f is the function name, x is the input variable. (2) f(x) = 3x - 2 means: take input x, multiply by 3, subtract 2. (3) Evaluating: f(4) = 3(4) - 2 = 10. Replace every x with 4. (4) f(-1) = 3(-1) - 2 = -5. Works with negatives too. (5) f(a) = 3a - 2. Works with var

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