Math 1 Warm Up Evaluate y= 2x + 5 for x = 4

Questions?

Evaluating Functions Objective: To learn to evaluate functions from given domain values. function rule – is an equation that describes a function. An “input ⟶ output” machine

Function Rule & Function Notation

Example 1 Evaluate f(x) = -5x + 25 for x = -2

Example 2 Evaluate g(x) = 2 𝟒𝒙 −𝟕 for x = -5

Example 3 Evaluate h(x) = 4x² − 2x for x = -3

Example 4 Evaluate h(t) = -3t³ + 2t² – 4t for t = -3

Example 5

Writing Function Rules x Y 1 5 2 6 3 7 4 8 Look for a pattern: Ask yourself “what can I do to X to get Y?” F(x) = x + ?

x Y 1 3 9 6 36 81 x Y 1 2 4 3 6 8

x Y 1 2 8 3 27 x Y -2 -8 -1 -4 1 4

x Y -8 64 -4 16 4 x Y 1 0.5 2 3 1.5 4

Assignment In the textbook… pp. 244-245 #15-22, 32, 34-37, 41, 42