Question 1
Learning objective
Using Boolean algebra: Be familiar with the use of Boolean identities and De Morgan’s laws to manipulate and simplify Boolean expressions.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Boolean algebra
Subtopic
Using Boolean algebra
Aqa A Level Computer ScienceFundamentals of computer systems
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Quick explanation
Using Boolean algebra: Be familiar with the use of Boolean identities and De Morgan’s laws to manipulate and simplify Boolean expressions
- This point belongs to Boolean algebra, especially Using Boolean algebra.
- You need to be able to using Boolean algebra: Be familiar with the use of Boolean identities and De Morgan’s laws to manipulate and simplify Boolean expressions.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Why it matters
This objective helps connect Using Boolean algebra to exam-style questions, flashcards, and revision notes for Boolean algebra.
Quick student answer
Using Boolean algebra, simplify A + AB.
Direct answer
A
Key terms
- Boolean identity: A rule in Boolean algebra that allows an expression to be rewritten in an equivalent form, such as A AND 1 = A.
- De Morgan’s laws: Two Boolean algebra rules stating that NOT(A AND B) = NOT A OR NOT B and NOT(A OR B) = NOT A AND NOT B.
Common trap
Failing to change the operator in De Morgan’s law: When applying De Morgan’s law, negate each operand and change AND to OR, or change OR to AND.
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