Evaluating Functions and Function Notation

Which set of values is a function?

• (9,5) (10,5) (9,-5) (10,-5)

• (3,4) (4,-3) (7,4) (3, 8)

• (6,-5) (7, -3) (8, -1) (6, -5)

• (2, -2) (5, 9) (5, -7) (1, 4)

Given that f(x) = x² - 8, find f(2) - f(3).

• -7

• 5

• -1

• -5

• 7

Given that f(x) = 6x² - 2x + 1, find f(-2) - 4.

• 29

• -19

• 25

• -23

• 20

Given that h(e) = 5^e+3, find h(11) + 9.

• 70

• 6103515634

• 6103515625

• 79

• 6101010101

What should we know immediately upon seeing f(x) (or any other variables in that form)?

• it is y

• it is x

• it is a function

• it is ugly

• it is a hard problem

If a question asks you to find f(2), what does that mean?

• Let x = 2

• Let y = 2

If f(x) = 2x+1, what would the function look like once you substitute in a 1 to find f(1)?

• f(x) = 21+1

• f(1) = 2 (1) + 1

• f(1) = 2x (1) + 1

If f(x) = -3x - 8, find f(-1).

• f(-1) = 5

• f(-1) = -5

• f(-1) = -12

• f(-1) = -10

g(x) = 3x + 1
g(2) = _______

• 6

• 7

• 8

• 9

What is the value of f(0)?

• -2

• 2

• 4

• 0