Evaluating Functions Precalc

If f(x) = 2x + 1, what would be your first step to find f(1)?

• Plug a 1 in for all the x's

• Set the function equal to 1

• Only plug a 1 into the left side

• Only plug a 1 into the right side

Given f(x) = -4x - 10 and f(x) = 10. Find x

• x = -5

• x = 5

• x = -50

• x = 30

Let g(x)=9x+24, find g(3).

• 3

• 33

• 51

• -2.66

Evaluate f(x) = x² for f(-8)

• 64

• -64

• -16

• 16

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

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

If I know that f(2) = 4, what is another way I can write my answer?

• 2,4

• (2, 4)

• That is the only way to write it.

If f(x) = 2x + 1, find f(1).

• f(1) = 1

• f(1) = 4

• f(1) = 0

• f(1) = 3

Evaluate f(-2) if f(x) = x + 3

• -1

• 1

• 5

• -5

f(x) is the same thing as ______.

• y

• x

• input

• an equation

Given g(x) =
 4x - 7, find g(-9). 

• g(-9) = 29

• g(-9) = -43