Function notation
Lesson 16 of 20 in Union Aptitude Prep. The start plays free here.
- A relationship shown in a table
- The relationship written in words
- The relationship written as a rule
- f(x): f of x
- x → exactly one output
- Rule: f(x) = x − 5
- Table: (5, 0), (6, 1), (7, 2)
- Graph: plot (5, 0), (6, 1), (7, 2)
- Number series trainer
- Algebra & functions with worked steps
- Reading comprehension sets
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How the lesson starts
You may be asked to match a table with another form of the same relationship. Function notation gives you a way to write that relationship.
You see f(x) in a problem. Read it as “f of x.” It names the function's output, not f times x.
Then, in the full lesson
- Input and output
- Use the rule
- Read the table
- Show the graph
- 2 questions along the way
A question from this lesson
The rule is f(x) = x − 5. What is f(8)?
- 3
- 40
- 13
Show the answer
A. 3. 3 is eight minus five. Getting 13 adds five instead of subtracting. Getting 40 multiplies eight by five instead of following the rule.
The full class, $39 once.
Paid once, no subscription. Ask for a refund within 7 days of buying if you’ve done less than 25% of the class.
- Number series trainer
- Algebra & functions with worked steps
- Reading comprehension sets
Not affiliated with IBEW, NECA, ETA or any JATC. Original practice questions only.