Grade 9 · Math · Algebra 1

9th grade Function notation: read and evaluate f(x), including f(x + 2) and f(2x) worksheet

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Function notation: read and evaluate f(x), including f(x + 2) and f(2x)

Grade 9 Math Worksheet

NameDate

Circle the best answer, or write your answer on the line.

Ari's toy rocket climbs. Its height is f(s) = 6s − 4 meters after s seconds. What is f(7)?
Bo's robot builds a tower. The tower has f(m) = 4m + 12 blocks after m minutes. What is f(15)?
Esme's game gives stars. The score is f(r) = 7r − 9 after r rounds. What is f(6)?
Jun rides a school bus. The riders on board are f(s) = 3s + 7 after s stops. What is f(12)?
Luz invents a number game: f(x) = x² − 3x + 1. Luz tries the input −5. What is f(−5)?
Milo's calculator follows f(x) = x² + 2x + 5. Milo types in −4. What is f(−4)?
7.
Noah sells cookies. The function c(n) gives the cost in dollars of n cookies, and c(5) = 12. What does c(5) = 12 tell us?
- Each cookie costs $12
- 12 cookies cost $5
- 5 cookies cost $12
8.
Pia's plant is growing. The function h(w) gives its height in cm after w weeks, and h(6) = 30. What does h(6) = 30 tell us?
- The plant grows 30 cm each week
- After 30 weeks, the plant is 6 cm tall
- After 6 weeks, the plant is 30 cm tall
Zee's snack cart follows f(x) = 3x − 4 for the dollars earned after x sales. For which x does f(x) = 23?
Ari's sharpening game follows f(x) = 4x − 6 for the points after x pencils. For which x does f(x) = 42?

Function notation. Every version has 10 questions, and the answer key prints on the second page.

Standard: F-IF.A.2, F-IF.A.1

function notation: f(4) means the output of f when the input is 4.

input: The number in the brackets, f(input).

output: What comes out of the rule, the number after the equals sign.

evaluate: Put a number in for x and work out the output.

expression input: An input like x + 4 or 2x instead of a number.

Your child counted rows from the top instead of looking for the input.

Your child gave the number of the row instead of its input.

Your child gave the output when the question asked for the input.

Ask: which number in the first column is the same as the number in the brackets?

Ask: which number goes into the machine, and which number comes out?

Ask: in f(x) = 14, which number is the output and which one are we looking for?

What is the most common mistake with function notation: read and evaluate f(x), including f(x + 2) and f(2x)?

Your child counted rows from the top instead of looking for the input.

How can I help my child with function notation: read and evaluate f(x), including f(x + 2) and f(2x)?

Ask: which number in the first column is the same as the number in the brackets?

Are these 9th grade math worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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