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Substitution
You might be asked to substitue a number into an expression.
For example , what is the value of 4p3 when p = 2?
We know that 4p3 means 4 × p × p × p, so when p = 2 we substitute this into the expression: 4 × 2 × 2 × 2 (or 4 × 23) = 32
- Question
What is the value of 4y2 - y, when y = 3?
- Answer
33
Remember that (4 × y × y) - y, becomes (4 × 3 × 3) - 3 or 36 - 3.
Now try a Test Bite
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