Substitution (HSC SSCE Mathematics Standard): Flashcards
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Definition of substitution
Definition of substitution
Replacing letters (variables) with numbers in an expression
4 steps of substitution
4 steps of substitution
Write expression, replace variables, evaluate, write answer
Why use brackets when substituting?
Why use brackets when substituting?
To avoid mistakes with negative numbers and operations
Linear expression
Linear expression
Variables with power of 1 (or no power shown)
Non-linear expression
Non-linear expression
Contains variables with powers or square roots
Order of operations acronym
Order of operations acronym
BIDMAS/BODMAS
Power operations in order of operations
Power operations in order of operations
Happen before multiplication
When to take square root
When to take square root
After completing all operations inside the root symbol
Subtracting a negative number
Subtracting a negative number
Becomes addition (two negatives make a positive)
Most common substitution error
Most common substitution error
Forgetting brackets around substituted values