AlgebraStudy Notes
Worked Example 4: Basic Substitution
Part of Simplifying Expressions — GCSE Mathematics
This study notes covers Worked Example 4: Basic Substitution within Simplifying Expressions for GCSE Mathematics. Revise Simplifying Expressions in Algebra for GCSE Mathematics with 11 exam-style questions and 5 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 11 of 18 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 11 of 18
Practice
11 questions
Recall
5 flashcards
Worked Example 4: Basic Substitution
Find the value of 3a + 2b when a = 4 and b = 5
Step 1 Write the expression
3a + 2b
Step 2 Substitute the values
= 3(4) + 2(5)
Replace a with 4 and b with 5
Step 3 Calculate using BIDMAS
= 12 + 10
= 22