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You learn how to put values into a rule and find the output it gives. You also see how one quantity can depend on another, which helps you read tables, graphs and simple change patterns.
You should be comfortable with order of operations, simple algebra, and squaring numbers. It also helps if you can read basic tables and use symbols such as x and y.
One question from this skill's own question bank, shown with its full working.
If f(x) = 2x + 3, find f(4).
Working: f(4) = 2(4) + 3 = 8 + 3 = 11.
This topic normally appears in SHS algebra work on functions and variation. It supports questions at WASSCE level where you may need to evaluate a rule, interpret a mapping, or solve a direct variation problem.
Curriculum notes are a general guide to where this work normally sits. Always check the syllabus your school or examination body is currently using.
Other SHS Core: Functions, Variation & Sequences skills in Maths, at the same point in the course.
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6 questions with a worked answer after every attempt, and a SmartScore that tracks how close you are to mastery.