Evaluate Function

Evaluate Functions

To evaluate functions, substitute the given value in for x.

• For example, if

  • f(x) = 4x - 8, then f(3) = 4(3) - 8, which means f(3) = 4

  • g(x) = x² + 3x, then g(-1) = (-1)² + 3(-1), which means f(-1) = -2

Multiple Choice

Evaluate g(x) = 11 - x

for g(-7). 

• 4

• 17

• 18

• -77

Multiple Choice

Evaluate f(x)=x²-5x for f(4).

• -4

• 126

• 24

• 84

Multiple Choice

Evaluate g(x) = 3x² - 11 for g(-5).

• f(-5) = 64

• f(-5) = -86

• f(-5) = 214

• f(-5) = -7

Multiple Choice

Evaluate f(t)=-2t²+ 1 for f(-3).

• 19

• 37

• -17

• -11

Multiple Choice

What is f(6) for the function f(x)=3x-8

• -8

• 10

• -144

• answer not here

Multiple Choice

$$Given\ f\left(x\right)=\frac{3}{2}x+5\ what\ is\ f\left(12\right)?$$  

• $$\frac{43}{2}$$  

• $$20$$  

• $$23$$  

• $$5$$  

Multiple Choice

What is  $$f\left(0\right)$$   for the function $$f\left(x\right)=2x+3$$  

• 2x

• -3

• 3

• 10

Multiple Choice

$$Given\ h\left(x\right)=3x^2-2x+8\ what\ is\ h\left(2\right)?$$  

• 13

• 8

• 16

• answer not here

Multiple Choice

If f(x) = 2x² + 5x - 3, evaluate f(-1).

• f(-1) = -6

• f(-1) = 1

• f(-1) = -10

• f(-1) = -1

Evaluating Functions on a Graph

x-axis = input

y-axis = output

Multiple Choice

Evaluate f(2).

Click on the picture to make it larger.

• f(2) = 5

• f(2) = 12

• f(2) = 10

• f(2) = 0.5

Answer for previous slide

Multiple Choice

Evaluate for f(-5)

Click on the picture to make it larger.

• 1

• 0

• 2

• -2

Evaluate for f(-5)

Answer for previous slide

When x = -5, y = -2...

so: f(-5) = -2

Multiple Choice

Evaluate for f(1)

Click on the picture to make it larger.

• 0

• -3

• 3

• 2

Answer for previous slide

Multiple Choice

What is the value of f(0)?

Click on the picture to make it larger.

• -2

• 2

• 4

• 0

Answer for previous slide