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**Changing the Subject of a Formula**

Dr Frost

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Motivation The formula to calculate a temperature in Fahrenheit if we have the temperature in Celsius: But what if we had say the temperature in Fahrenheit, and wanted to know it in Celsius?

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Motivation C is now the subject of the formula. If we have some value of F, we can now more easily substitute it in to give us a value for C.

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Learning Objectives Be able to make a term the subject of a formula, possibly involving brackets, squared terms and square roots.

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**x = ? ‘Solving’ an equation**

Solving an equation means that we make a given variable the subject of the formula. x = ?

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**Questions STP9A - Page 188 Exercise 9D: Q1, 3, 5.**

Exercise 9E: Odd questions.

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Frost Conundrum FC At what temperature do we get the same reading regardless of whether we use Fahrenheit or Celsius?

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Recap Make x the subject.

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Questions Rayner – page 176 Exercise 4 Exercise 5

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