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Topic: Formulae and Algebraic Argument (Foundation - Unit 2)

Specification References: N5.6 N5.6 Derive a formula, substitute numbers into a formula and change the subject of a formula.

Candidates should be able to:

• use formulae from mathematics and other subjects expressed initially in words and then using letters and symbols
• substitute numbers into a formula
• change the subject of a formula

Notes

Questions in Unit 2 will include formulae for generating sequences; for example, write down the first three terms of a sequence where the n^th term is given by n² + 4 (see spec. reference N6.1).

Questions in Unit 2 will include formulae in words using a functional context; for example, a formula for cooking a turkey.

Questions may in include formulae out of context; for example, substitute positive and negative numbers into expressions such as , 3x² and 2x³

At Foundation tier, formulae to be rearranged will need at most two operations and will not include any terms including a power.

Examples

1. Use the formula ‘wage earned = hours worked × hourly rate + bonus’, to calculate the wage earned when Sarah works for 30 hours at £8.50 at hour and receives a bonus of £46 in tips.

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