9/2 Function Notation - Evaluating

9/2 Function Notation - Evaluating

​Math Analysis Honors

by Ms. Kunkel

​Function Notation f(x)

​y can be written as the function of x. Instead of y write f(x)

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Ex. 1: f(-2), plug in -2 for x.

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Ex. 2: f(x) = 16, plug in 16 for f(x).

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​Ex. 3: f(x+5), plug in the whole

expression x+5 for x.

From Mapping and Graphs

Ex. 3: Find f(3)   

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Answer f(3)= 7

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​Ex. 4: f(x) = 5, find x

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​Answer x - 2

Multiple Choice

How would you write y = 2x - 3 in function notation?

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

Multiple Choice

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

• 21

• -11

• -31

• 25

Multiple Choice

If f(x) = 2x² + 5x - 3,

evaluate f(-1).

• f(-1) = -6

• f(-1) = 1

• f(-1) = -10

• f(-1) = -1

Multiple Choice

What is x if f(x) = -2?

• 4

• 0

• 3

• 8

Multiple Choice

f(x) is the same thing as ______.

• y

• x

• input

• an equation

Multiple Choice

Given f(x)=5x-2 and g(x)=x²,

find f(2)+g(7)

• 8

• 57

• 49

• -41

Multiple Choice

If f(x) = -4x - 5 and g(x) = 3 - x,

what is g(-4) + f(1)?

• 7

• -2

• -9

• -10

Multiple Choice

If h(x) = -5x + 7, Evaluate 6h(2).

• -2

• 3

• -18

• -3

Multiple Choice

Given f(x)=2x+1,

FIND x if f(x)=16.

• 8

• 15/2

• 14/2

• -7

Multiple Choice

If  $$h\left(x\right)=3-\frac{1}{2}x$$  ,

find  $$h\left(-4\right).$$  

• 5

• 2.5

• 1

• 2

​Week 4 Assignment

​Questions 1-20 due Tomorrow 9/3