Evaluating and Interpreting Functions

• 1

• 2

• 3

• 4

f(x)=4x+5
f(4)=

• 21

• -11

• -31

• 25

Evaluate f(-2) if f(x) = x²+ 3

• -1

• 1

• 7

• -7

Given h(x) = 5 - 9x, find h(8). 

• h(8) = -360

• h(8) = -67

Given f(x) = 2x² + 5x - 17, find f(-1). 

• f(-1) = -20

• f(-1) = -24

f(x) is the same thing as ______.

• y

• x

• input

• an equation

For the function f(x) = -3x + 3 find f(0).

• 0

• -3

• 3

• -1

Does the mapping diagram represent a function? Explain.

• No; the input values (x-values) of 1 and 3 are both paired with the same output (y-value).

• No; there are more input values (x-values) than output values (y-values).

• Yes; each input (x-value) is paired with only one output (y-value).

• You can't tell if a relation is a function from a mapping.

Evaluate y = 7x when x = -5

• -35

• 35

• 2

• 75

Evaluate f(x)=-2x+13   for f(10)

• -7

• 1

• -8

• 7